certain

cer·tain
C3E1R1T1A1I1N1
UK/ˈsɜː.tən/UK/ˈsɜː.tn̩/Canada, US/ˈsɝ.tən/Canada, US/ˈsɝ.tn̩/

adjective

Sure in one's mind, positive; absolutely confident in the truth of something.

“I was certain of my decision.”

Opposite
Very commonScrabble 9

Meanings

certain1

adjectivecertain (comparative more certain or certainer, superlative most certain or certainest)

comparative more certain · comparative certainer · superlative most certain · superlative certainest · alternative obsolete certaine · alternative archaic certayne · alternative archaic certeine

  1. Sure in one's mind, positive; absolutely confident in the truth of something.

    I was certain of my decision.

    2 more examples

    […] I think, nay, I may say that I'm sartain, we'll have a hurricane afore morning. It's not the first time I've cruised in these latitudes.

    1833, [Frederick Marryat], chapter VIII, in Peter Simple. […], volume III, London: Saunders and Otley, […], published 1834, →OCLC, page 113

    I GET letters from you far too seldom considering that you can much more easily find people starting for Rome than I to Athens: considering, too, that you are more certain of my being at Rome than I of your being at Athens.

    1920, Cicero, translated by Evelyn Shirley Shuckburgh, The Letters of Cicero: The Whole Extant Correspondence in Chronological Order, volume 1 (hardcover), London: G. Bell and Sons, Ltd., page 5
  2. Not to be doubted or denied; established as a fact.

    Now that more experiments have been run, the theory is certain and the argument is settled.

    1 more example

    […]the dreame is certaine, and the interpretation thereof ſure.

    1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Daniel 2:45, column 1
  3. Sure to happen, inevitable; assured.

    Bankruptcy is the certain outcome of your constant gambling and lending.

    3 more examples

    It is certain that Spain will reach the finals. / Spain is now certain to reach the finals. / Spain is now certain of a place in the finals.

    […]death (as the Pſalmiſt ſaith) is certaine to all, all ſhall die.

    c. 1596–1599 (date written), William Shakespeare, The Second Part of Henrie the Fourth, […], quarto edition, London: […] V[alentine] S[immes] for Andrew Wise, and William Aspley, published 1600, →OCLC, [Act III, scene ii]

    How vain is Virtue which directs our ways Through certain danger to uncertain praiſe!

    1675, John Dryden, Aureng-zebe: A Tragedy. […], London: […] T[homas] N[ewcomb] for Henry Herringman, […], published 1676, →OCLC, Act II, page 29

    Synonyms: unavoidable

  4. Unfailing; infallible.

    I have often wished, that I knew so certain a remedy in any other disease

    1702, Richard Mead, Mechanical Account of Poisons
    1 more example

    You can walk down the streets, of course, and follow a person dressed in a certain style in the hope they will lead you to a certain kind of place, but it is easier and far more certain to buy a guidebook—a guidebook for special persons of special tastes.

    1990, Jane DeLynn, Don Juan in the Village, page 17
  5. Fixed; regular; determinate.

    at certain intervals

    1 more example

    Then ſaid the Lord vnto Moſes, Behold, I will raine bread from heauen for you: and the people ſhall goe out, and gather a certaine rate euery day, that I may proue them, whether they will walke in my Law, or no.

    1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Exodus 16:4, column 1
  6. Particular and definite, but unspecified or unnamed; used to introduce someone or something without going into further detail.

    Each morning, she would see a certain man rush past her window on his way to work.

    3 more examples

    Every wine has a certain distinctive character which sets it apart from all others.

    And it came to paſſe, when he was in a certaine citie[…]

    1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Luke 5:12, column 1

    About everything that he wrote, serious or sportive, there was a certain natural grace and decorum[…]

    1856 February, [Thomas Babington] Macaulay, “[Contributions to the Encyclopædia Britannica.] Oliver Goldsmith.”, in T[homas] F[lower] E[llis], editor, The Miscellaneous Writings and Speeches of Lord Macaulay, new edition, London: Longman, Green, Reader, & Dyer, published 1871, →OCLC, page 365
  7. euphemisticpreceded by "a"Used to denote that the speaker is referring to a specific person or thing that they do not want to name directly, implying that the listener should infer the identity of the referent.

    I would have been here on time, but a certain someone lost the car keys!

  8. preceded by "a"Named but not previously mentioned.

    Looking inside the cover, they learned that the book had once belonged to a certain R. Jones.

    1 more example

    About 140 years ago, for example, a certain Hsü Kuang-ming established an ancestral estate in Wanluan consisting of ten hectares. The trust was specifically set aside to provide for his own worship after death, and access to its profits was to be enjoyed only by his descendants.

    1972, Burton Pasternak, “Kinship”, in Kinship & Community in Two Chinese Villages, Stanford, CA: Stanford University Press, →ISBN, →LCCN, →OCLC, pages 75–76

    Synonyms: one

  9. preceded by "a"Used before the name of someone famous that people are expected to know.

    Since the last British government to make such a proposal was that of a certain Margaret Thatcher, it might not seem unreasonable.

    Synonyms: one

  10. obsoleteDetermined; resolved.

    However I with thee have fixt my Lot, Certain to undergoe like doom[…]

    1667, John Milton, “Book VIII”, in Paradise Lost. […], London: […] [Samuel Simmons], and are to be sold by Peter Parker […]; [a]nd by Robert Boulter […]; [a]nd Matthias Walker, […], →OCLC; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873, →OCLC, lines 952–953
determiner

alternative obsolete certaine · alternative archaic certayne · alternative archaic certeine

  1. Having been determined but not specified.

    Certain people are good at running.

    1 more example

    One saint's day in mid-term a certain newly-appointed suffragan-bishop came to the school chapel, and there preached on “The Inner Life.”

    1918, W[illiam] B[abington] Maxwell, chapter V, in The Mirror and the Lamp, Indianapolis, Ind.: The Bobbs-Merrill Company, →OCLC, page 26
pronoun

alternative obsolete certaine · alternative archaic certayne · alternative archaic certeine

  1. with ofUnnamed or undescribed members (of).

    She mentioned a series of contracts, of which certain are not cited.

    1 more example

    […]certaine of the Jewes banded together[…]

    1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Acts 23:12, column 2

    Synonyms: some

Certain2

proper nounCertain (plural Certains)

plural Certains

Synonyms & antonyms

adjectiveSure to happen, inevitable; assured.

adjectiveNamed but not previously mentioned.

Similar

adjectiveUsed before the name of someone famous that people are expected to know.

Similar

pronounUnnamed or undescribed members (of).

Similar

antonym(s) of “not doubting”

Opposite

antonym(s) of “sure to happen”

antonym(s) of “known but not named”

Opposite
particular specific

More synonyms by meaning

adjectivedefinite but not specified or identified

Similar

adjectivehaving or feeling no doubt or uncertainty; confident and assured

Opposite

adjectiveestablished beyond doubt or question; definitely known

Opposite

adjectivecertain to occur; destined or inevitable

Opposite

adjectiveestablished irrevocably

Similar

adjectivereliable in operation or effect

adjectiveexercising or taking care great enough to bring assurance

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Latincertus“fixed, resolved, certain”
  2. Old Frenchcertain
  3. Middle Englishcerteyn
  4. Englishcertain

From Middle English certeyn, certein, certain, borrowed from Old French certain, from a Vulgar Latin unattested form *certānus, extended form of Latin certus (“fixed, resolved, certain”), of the same origin as cretus, past participle of cernere (“to separate, perceive, decide”). Displaced native Middle English wis, iwis (“certain, sure”) (from Old English ġewiss (“certain, sure”)) and alternative Middle English spelling sertane (“some, certain”).

Full word history & related roots →

Translations

Ancient Greek ἔμπεδος, τις
  • ἔμπεδος (émpedos)sure, positive, not doubting
  • τις (tis)not specifically named, indeterminate, indefinite
Arabic أَكِيد, مُتَأَكِّد
  • أَكِيد (ʔakīd)sure, positive, not doubting
  • مُتَأَكِّد (mutaʔakkid)sure, positive, not doubting
  • بَعْض (baʕḍ)not specifically named, indeterminate, indefinite
  • مُحَدَّد (muḥaddad)having been determined but not specified
Bulgarian си́гурен, уве́рен
  • си́гурен (síguren)sure, positive, not doubting
  • уве́рен (uvéren)sure, positive, not doubting
  • някакъв (njakakăv)not specifically named, indeterminate, indefinite
  • някой си (njakoj si)not specifically named, indeterminate, indefinite
  • определен (opredelen)having been determined but not specified
Catalan cert, cert
  • certsure, positive, not doubting
  • certnot specifically named, indeterminate, indefinite
  • certhaving been determined but not specified
Chinese Mandarin 肯定, 確切 /确切
  • 肯定 (kěndìng)sure, positive, not doubting
  • 確切 /确切 (quèqiè)sure, positive, not doubting
  • 一定 (yīdìng)sure, positive, not doubting
  • 有的 (yǒu de)not specifically named, indeterminate, indefinite
  • 某 (mǒu)not specifically named, indeterminate, indefinite
  • 某 (mǒu)having been determined but not specified
  • 有的 (yǒude)having been determined but not specified
Czech jistý, nějaký
  • jistýsure, positive, not doubting
  • nějakýnot specifically named, indeterminate, indefinite
  • jistýhaving been determined but not specified
  • určitýhaving been determined but not specified
Danish sikker, vis
  • sikkersure, positive, not doubting
  • vishaving been determined but not specified
  • visthaving been determined but not specified
  • vissehaving been determined but not specified
Dutch zeker, zeker
  • zekersure, positive, not doubting
  • zekernot specifically named, indeterminate, indefinite
  • bepaaldnot specifically named, indeterminate, indefinite
Esperanto certa, certa
  • certain reference to a specific person or thing that the speaker does not want to name directly
  • certasure, positive, not doubting
  • certahaving been determined but not specified
Finnish varma, eräs
  • varmasure, positive, not doubting
  • eräsnot specifically named, indeterminate, indefinite
  • yksinot specifically named, indeterminate, indefinite
  • tiettyhaving been determined but not specified
  • muuanhaving been determined but not specified
  • erääthaving been determined but not specified
French certain, certain
  • certainsure, positive, not doubting
  • certainnot specifically named, indeterminate, indefinite
  • quelconquenot specifically named, indeterminate, indefinite
  • certainhaving been determined but not specified
German gewiss, sicher
  • gewisssure, positive, not doubting
  • sichersure, positive, not doubting
  • gewissnot specifically named, indeterminate, indefinite
  • irgendeinnot specifically named, indeterminate, indefinite
  • bestimmthaving been determined but not specified
  • gewisshaving been determined but not specified
Greek βέβαιος
  • βέβαιος (vévaios)sure, positive, not doubting
Hindi निश्चित, निश्चित
  • निश्चित (niścit)sure, positive, not doubting
  • निश्चित (niścit)having been determined but not specified
Hungarian biztos, bizonyos
  • biztossure, positive, not doubting
  • bizonyossure, positive, not doubting
  • bizonyosnot specifically named, indeterminate, indefinite
  • egyesnot specifically named, indeterminate, indefinite
  • némelynot specifically named, indeterminate, indefinite
  • egyfajtanot specifically named, indeterminate, indefinite
  • egynémelynot specifically named, indeterminate, indefinite
  • bizonyoshaving been determined but not specified
  • egyeshaving been determined but not specified
  • némelyhaving been determined but not specified
Icelandic viss, öruggur
  • visssure, positive, not doubting
  • öruggursure, positive, not doubting
  • ákveðinnhaving been determined but not specified
  • visshaving been determined but not specified
Irish cinnte, dearfa
  • cinntesure, positive, not doubting
  • dearfasure, positive, not doubting
  • deimhinsure, positive, not doubting
Italian certo, sicuro
  • certosure, positive, not doubting
  • sicurosure, positive, not doubting
  • certonot specifically named, indeterminate, indefinite
  • talenot specifically named, indeterminate, indefinite
  • certohaving been determined but not specified
  • certahaving been determined but not specified
  • determinatohaving been determined but not specified
  • determinatahaving been determined but not specified
Japanese 某, 確か
  • 某 (bō-)in reference to a specific person or thing that the speaker does not want to name directly
  • 確か (tashika)sure, positive, not doubting
  • 一定 (ittei)sure, positive, not doubting
  • 定か (sadaka)sure, positive, not doubting
  • 特定の (tokutei no)sure, positive, not doubting
  • ある (aru)not specifically named, indeterminate, indefinite
  • ある (aru)having been determined but not specified
  • とある (toaru)having been determined but not specified
Korean 확실하다, 어느
  • 확실하다 (hwaksilhada)sure, positive, not doubting
  • 어느 (eoneu)not specifically named, indeterminate, indefinite
  • 특정 (teukjeong)not specifically named, indeterminate, indefinite
Latin certus, fidus
  • certussure, positive, not doubting
  • fidussure, positive, not doubting
  • quīdamnot specifically named, indeterminate, indefinite
  • quīdamhaving been determined but not specified
Māori taketake
  • taketakesure, positive, not doubting
Norwegian sikker, viss
  • sikkersure, positive, not doubting
  • visssure, positive, not doubting
  • visshaving been determined but not specified
  • vissthaving been determined but not specified
  • vissehaving been determined but not specified
  • enkeltehaving been determined but not specified
Polish pewny, jakiś
  • pewnysure, positive, not doubting
  • jakiśnot specifically named, indeterminate, indefinite
  • niejakinot specifically named, indeterminate, indefinite
Portuguese certo, certo
  • certosure, positive, not doubting
  • certohaving been determined but not specified
Romanian cert, anume
  • certsure, positive, not doubting
  • anumesure, positive, not doubting
  • sigursure, positive, not doubting
  • anumithaving been determined but not specified
Russian уве́ренный, определённый
  • уве́ренный (uvérennyj)sure, positive, not doubting
  • определённый (opredeljónnyj)sure, positive, not doubting
  • не́который (nékotoryj)not specifically named, indeterminate, indefinite
  • како́й-то (kakój-to)not specifically named, indeterminate, indefinite
  • не́кий (nékij)not specifically named, indeterminate, indefinite
  • не́который (nékotoryj)having been determined but not specified
  • определённый (opredeljónnyj)having been determined but not specified
  • не́кий (nékij)having been determined but not specified
Scottish Gaelic cinnteach, deimhinne
  • cinnteachsure, positive, not doubting
  • deimhinnesure, positive, not doubting
Slovak istý, nejaký
  • istýsure, positive, not doubting
  • nejakýnot specifically named, indeterminate, indefinite
Spanish (ser) cierto / certero, impepinable
  • (ser) cierto / certeroNot to be doubted or denied; established as a fact
  • impepinableNot to be doubted or denied; established as a fact
  • (estar) cierto / certeroSure to happen, inevitable; assured
  • saberseSure to happen, inevitable; assured
  • ser una certeza / certidumbre / certitudSure to happen, inevitable; assured
  • (estar) certero / ciertosure, positive, not doubting
  • ciertonot specifically named, indeterminate, indefinite
  • ciertohaving been determined but not specified
  • ciertahaving been determined but not specified
Swahili fulani
  • fulaninot specifically named, indeterminate, indefinite
Swedish säker, viss
  • säkersure, positive, not doubting
  • visshaving been determined but not specified
  • vissthaving been determined but not specified
  • vissahaving been determined but not specified
Thai แน่นอน
  • แน่นอน (nɛ̂ɛ-nɔɔn)sure, positive, not doubting
Turkish kesin, emin
  • kesinsure, positive, not doubting
  • eminsure, positive, not doubting
  • malumnot specifically named, indeterminate, indefinite
  • bazınot specifically named, indeterminate, indefinite
  • belli başlınot specifically named, indeterminate, indefinite
  • bellihaving been determined but not specified
  • malumhaving been determined but not specified
  • belirlihaving been determined but not specified
  • muayyenhaving been determined but not specified
Ukrainian упе́внений, пе́вний
  • упе́внений (upévnenyj)sure, positive, not doubting
  • пе́вний (pévnyj)sure, positive, not doubting
  • яки́йсь (jakýjsʹ)not specifically named, indeterminate, indefinite
  • котри́йсь (kotrýjsʹ)not specifically named, indeterminate, indefinite
  • де́який (déjakyj)not specifically named, indeterminate, indefinite
  • пе́вний (pévnyj)having been determined but not specified
  • де́який (déjakyj)having been determined but not specified
Vietnamese chắc chắn
  • chắc chắnsure, positive, not doubting
Yiddish זיכער, געוויס
  • זיכער (zikher)sure, positive, not doubting
  • געוויס (gevis)not specifically named, indeterminate, indefinite
  • געוויס (gevis)having been determined but not specified

Rhymes & wordplay

Rhymes with certain

All rhymes →

Anagrams

Cite this entry
APA

certain. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/certain

MLA

“certain.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/certain. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “certain,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/certain.

Source: certain on Wiktionary, CC BY-SA 4.0.