illegitimate

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/ɪlɪˈd͡ʒɪtɪmət/US[ɪlɨˈd͡ʒɪɾəmɨt]New Zealand/ɘlɘˈdʒɘtɘmɘt//ɪlɪˈd͡ʒɪtɪmeɪt/

adjective

Not conforming to known principles, or established or accepted rules or standards.

“an illegitimate child”

Less commonScrabble 15

Meanings

adjectiveillegitimate (comparative more illegitimate, superlative most illegitimate)

comparative more illegitimate · superlative most illegitimate

  1. Not conforming to known principles, or established or accepted rules or standards.

    […] it may be impossible to convince them that the illegitimate power which they obtain, by degrading themselves, is a curse […]

    1791 (date written), Mary Wollstonecraft, “The Prevailing Opinion of a Sexual Character Discussed”, in A Vindication of the Rights of Woman: With Strictures on Political and Moral Subjects, London: […] J[oseph] Johnson, […], published 1792, →OCLC, page 38
    2 more examples

    The so-called interstellar space […] has not the properties of ordinary space. It will not conduct sound, nor can a human being move through it. It is therefore illegitimate to measure it in miles.

    1927, J. B. S. Haldane, “Possible Worlds”, in Possible Worlds and Other Essays, London: Chatto and Windus

    Our attitude was that, to put it briefly, our presence there [in South Africa] was legal but illegitimate. We had an abstract right to be there, a birthright, but the basis of that right was fraudulent. Our presence was grounded in a crime, namely colonial conquest, perpetuated by apartheid.

    2009, J. M. Coetzee, “Martin”, in Summertime, New York: Viking, page 209

    Synonyms: invalid, nonstandard · Antonyms: legitimate, valid, acceptable, allowable, legit, legitimate, leveful, licit

  2. Not in accordance with the law.

    […] if things went on at this rate it would be doubtful soon whether ever again he would be able to win another election by methods legitimate or illegitimate.

    1914, Theodore Dreiser, chapter 54, in The Titan, New York: John Lane, page 475

    Synonyms: illegal, illicit, unlawful, crimeful, criminal, illegal, illicit, lawbreaking · Antonyms: legal, legitimate, de jure, lawful, legal, legitimate, licit, rightful

  3. Not sanctioned by marriage.

    His illegitimate birth deprived him of the influence of a father until perhaps his fifth year […]

    1916, chapter 6, in Abraham Brill, transl., Leonardo da Vinci: A Psychosexual Study of an Infantile Reminiscence, New York: Moffat, Yard, page 118
    1 more example

    If we credit the scandal of the former [i.e. his enemies], Artaxerxes sprang from the illegitimate commerce of a tanner’s wife with a common soldier.

    1783, Edward Gibbon, chapter 8, in The History of the Decline and Fall of the Roman Empire, volume 1, London: W. Strahan and T. Cadell, page 317

    Antonyms: legitimate

    1. Born to unmarried parents.

      an illegitimate child

      2 more examples

      I am a bastard begot, bastard instructed, bastard in mind, bastard in valour, in every thing illegitimate.

      c. 1602 (date written), William Shakespeare, “The Tragedie of Troylus and Cressida”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act V, scene vii]

      ‘This child,’ said Mr. Brownlow, drawing Oliver to him, and laying his hand upon his head, ‘is your half-brother; the illegitimate son of your father […]’

      1838, Boz [pseudonym; Charles Dickens], chapter 51, in Oliver Twist; […], volume (please specify |volume=I, II, or III), London: Richard Bentley, […], →OCLC

      Synonyms: natural · Antonyms: legitimate, legitimate, trueborn

    2. datedHaving a child or children with a person to whom one is not married.

      I heard last night that a what-do-you-call it?—claimant?—has arrived who says Pat Wayne is his illegitimate father.

      1935, Carolyn Wells, chapter 13, in The Beautiful Derelict, New York: Triangle Books, page 222
      1 more example

      She had only to collect her memories, which proved to her that “anybody” regarded the illegitimate children as more rightfully to be looked shy on and deprived of social advantages than illegitimate fathers.

      1876, George Eliot [pseudonym; Mary Ann Evans], chapter 27, in Daniel Deronda, volume (please specify |volume=I to IV), Edinburgh; London: William Blackwood and Sons, →OCLC

      Antonyms: legitimate, legitimate

  4. Not correctly deduced.

    an illegitimate inference

    2 more examples

    […] in natural things we must have recourse […] to experience. And all reasoning that is not supported so, ought to be repudiated, or at least suspected to be illegitimate.

    1658, Kenelm Digby, A Late Discourse […] Touching the Cure of Wounds by the Powder of Sympathy, London: R. Lownes and T. Davies, page 75

    […] it is illegitimate to reduce an Equation, by subducting from one Side a Quantity when it is not to be destroyed, or when an equal Quantity is not subducted from the other Side of the Equation:

    1734, George Berkeley, The Analyst, London: J. Tonson, Section 27, pp. 44-45

    Synonyms: illogical, invalid · Antonyms: legitimate, logical, valid

  5. Not authorized by good usage; not genuine.

    an illegitimate word

    Synonyms: bogus, ingenuine, spurious, artificial, bad, bogus, bollocks, concocted · Antonyms: bona fide, legitimate, actual, authentic, bona fide, genuine, legit, legitimate

  6. biologyInvolving the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers.

    illegitimate union; illegitimate fertilization

    1 more example

    […] the legitimate unions between the two forms of the above nine species of Primula are much more fertile than the illegitimate unions; although in the latter case pollen was always taken from a distinct plant of the same form.

    1877, Charles Darwin, chapter 1, in The Different Forms of Flowers on Plants of the Same Species

    Antonyms: legitimate

nounillegitimate (plural illegitimates)

plural illegitimates

  1. A person born to unmarried parents.

    Her father and mine was a shameless man and of all his illegitimates I am the most unfortunate and poverty stricken.

    1966, Jean Rhys, Wide Sargasso Sea, New York: Norton, Part 2, p. 96

    Synonyms: natural child, lovechild, bastard

verbillegitimate (third-person singular simple present illegitimates, present participle illegitimating, simple past and past participle illegitimated)

present singular third person illegitimates · participle present illegitimating · participle past illegitimated · past illegitimated

  1. transitiveTo make illegitimate.

Synonyms & antonyms

adjectiveNot conforming to known principles, or established or accepted rules or standards.

adjectiveNot sanctioned by marriage.

Opposite

adjectiveBorn to unmarried parents.

Similar

adjectiveHaving a child or children with a person to whom one is not married.

adjectiveNot correctly deduced.

adjectiveInvolving the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers.

Opposite

nounA person born to unmarried parents.

More synonyms by meaning

adjectivecontrary to or forbidden by law

adjectiveof marriages and offspring; not recognized as lawful

Opposite

nounthe illegitimate offspring of unmarried parents

Similar

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Latinillēgitimus
  2. Englishillegitimate

First attested in 1536, from Latin illēgitimus, most likely an adapted borrowing of Middle French illegitime, equivalent to il- + legitimate, see -ate (etymology 1, 2 and 3).

Full word history & related roots →

Translations

Ancient Greek νόθος
  • νόθος (nóthos)born to unmarried parents
Bulgarian незаконен, незаконно роден
  • незаконен (nezakonen)against the law
  • незаконно роден (nezakonno roden)born to unmarried parents
  • неправилен (nepravilen)illogical
Catalan il·legítim, il·legítim
  • il·legítimagainst the law
  • il·legítimborn to unmarried parents
Czech nemanželský
  • nemanželskýborn to unmarried parents
Danish uretmæssig, uberettiget
  • uretmæssigagainst the law
  • uberettigetagainst the law
  • illegitimborn to unmarried parents
  • uægteborn to unmarried parents
  • uægteskabeligborn to unmarried parents
  • ulogiskillogical
Dutch illegaal, onrechtmatig
  • illegaalagainst the law
  • onrechtmatigagainst the law
Esperanto malrajta, nelegitima
  • malrajtaagainst the law
  • nelegitimaborn to unmarried parents
Finnish epäkelpo, epäpätevä
  • epäkelponot conforming to known principles, or established or accepted rules or standards
  • epäpätevänot conforming to known principles, or established or accepted rules or standards
  • kelvotonnot conforming to known principles, or established or accepted rules or standards
  • säännönvastainennot conforming to known principles, or established or accepted rules or standards
  • laitonnot conforming to known principles, or established or accepted rules or standards
  • laitonagainst the law
  • lainvastainenagainst the law
  • aviotonborn to unmarried parents
  • vääräillogical
  • epälooginenillogical
  • epäpäteväillogical
  • vääränot genuine; not authorized by good usage
  • lehtolapsiperson born to unmarried parents
French illégitime, illégitime
  • illégitimeagainst the law
  • illégitimenot genuine; not authorized by good usage
German illegitim, unrechtmäßig
  • illegitimagainst the law
  • unrechtmäßigagainst the law
Greek παράνομος, νόθος
  • παράνομος (paránomos)against the law
  • νόθος (nóthos)born to unmarried parents
Irish neamhdhlisteanach, tabhartha
  • neamhdhlisteanachborn to unmarried parents
  • tabharthaborn to unmarried parents
Italian illegale, illegittimo
  • illegaleagainst the law
  • illegittimoborn to unmarried parents
  • illegittimonot genuine; not authorized by good usage
Japanese 違法な, 婚外の
  • 違法な (ihō na)against the law
  • 婚外の (kongai no)born to unmarried parents
  • 庶出の (shoshutsu no)born to unmarried parents
  • 偽のnot genuine; not authorized by good usage
  • 紛いの (magai no)not genuine; not authorized by good usage
Latin illegitimus, illegitimus
  • illegitimusagainst the law
  • illegitimusborn to unmarried parents
  • nothusborn to unmarried parents
  • spuriusborn to unmarried parents
Māori tama meamea, raparere
  • tama meameaperson born to unmarried parents
  • raparereperson born to unmarried parents
  • tīraumokoperson born to unmarried parents
  • pōriroperson born to unmarried parents
Polish nielegalny, nieślubny
  • nielegalnyagainst the law
  • nieślubnyborn to unmarried parents
Portuguese ilegal, ilegítimo
  • ilegalagainst the law
  • ilegítimoborn to unmarried parents
  • ilegítimonot genuine; not authorized by good usage
Romanian ilegitim, nelegal
  • ilegitimagainst the law
  • nelegalagainst the law
Russian нелигитимный, незако́нный
  • нелигитимный (neligitimnyj)not conforming to known principles, or established or accepted rules or standards
  • незако́нный (nezakónnyj)against the law
  • противозако́нный (protivozakónnyj)against the law
  • нелега́льный (nelegálʹnyj)against the law
  • нелегити́мный (nelegitímnyj)against the law
  • незаконный (nezakonnyj)born to unmarried parents
  • внебрачный (vnebračnyj)born to unmarried parents
Spanish ilegítimo, natural
  • ilegítimoborn to unmarried parents
  • naturalborn to unmarried parents
  • hijo ilegítimoperson born to unmarried parents
Swedish olaglig, illegal
  • olagligagainst the law
  • illegalagainst the law
  • illegitimagainst the law
  • lagstridigagainst the law
  • oäktaborn to unmarried parents
  • utomäktenskapligborn to unmarried parents
  • illegitimborn to unmarried parents
  • illegitimnot genuine; not authorized by good usage
Turkish yolsuz, gayrimeşru
  • yolsuzagainst the law
  • gayrimeşruagainst the law
  • gayrimeşruborn to unmarried parents
Ukrainian незаконнонаро́джений, незаконнонаро́джений
  • незаконнонаро́джений (nezakonnonaródženyj)born to unmarried parents
  • незаконнонаро́джений (nezakonnonaródženyj)person born to unmarried parents
Vietnamese đẻ hoang
  • đẻ hoangborn to unmarried parents
Cite this entry
APA

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

MLA

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

Chicago

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

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