tireless

T1I1R1E1L1E1S1S1

adjective

Indefatigable, untiring and not yielding to fatigue

Similar
untiringwearilessinexhaustibleindefatigableunflaggingunweariableunwearyingenergetic
Opposite
exhaustibledefatigableweariablewearying
OriginProto-Germanic *lausaz ← Proto-Indo-European *lewHs- ← English tire →
Less commonScrabble 8
Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

tireless1

adjectivetireless (not comparable)
  1. not comparableIndefatigable, untiring and not yielding to fatigue

    James Milner's angled free-kick was headed on to the post by the tireless Bent and Lampard the opportunist was perfectly placed to stoop and head in from virtually on the goal-line.

    2011 November 12, “International friendly: England 1-0 Spain”, in BBC Sport, archived from the original on 13 Aug 2022

    Synonyms: untiring, weariless

tireless2

adjectivetireless (not comparable)
  1. USnot comparableWithout a tire (wheel covering); tyreless.

    Synonyms: untiring, weariless

Synonyms & antonyms

adjectiveIndefatigable, untiring and not yielding to fatigue

Similar
untiringweariless

adjectiveWithout a tire (wheel covering); tyreless.

Similar
untiringweariless
Similar
inexhaustibleindefatigableunflaggingunweariableunwearying
Opposite
exhaustibledefatigableweariablewearying
Broader
activeenergeticobstinatepersistent
Similar
inexhaustibleindefatigableunflaggingunweariableunwearying
Opposite
exhaustibledefatigableweariablewearying
Broader
activeenergeticobstinatepersistent

More synonyms by meaning

adjectiveshowing sustained enthusiastic action with unflagging vitality

Similar
indefatigableunflaggingunwearyingenergetic

adjectivecharacterized by hard work and perseverance

Similar
hardworkingindustriousuntiringdiligent
Also see
diligenthardworkingindefatigableindustriousunflagginguntirableuntiringunwearying

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

tireless · adjective

  1. Englishtire
  2. Proto-Indo-European*lewh₁-
  3. Proto-Indo-European*lewHs-
  4. Proto-Germanic*leusaną
  5. Proto-Germanic*lausaz
  6. Englishtireless

From tire (“to become sleepy or weary”) + -less.

Full word history & related roots →

tireless · adjective

  1. Proto-West Germanic*teuʀōn
  2. Old Englishtēorian
  3. Middle Englishtiren
  4. Englishtire
  5. Proto-Indo-European*lewh₁-
  6. Proto-Indo-European*lewHs-
  7. Proto-Germanic*leusaną
  8. Proto-Germanic*lausaz
  9. Englishtireless

From tire + -less.

Full word history & related roots →

Translations

Ancient Greek ἀκάματος
  • ἀκάματος (akámatos)indefatigable
Bulgarian неуморен
  • неуморен (neumoren)indefatigable
Catalan incansable
  • incansableindefatigable
Chinese Mandarin 不倦, 不知疲倦的
  • 不倦 (bùjuàn)indefatigable
  • 不知疲倦的 (bùzhī píjuàn de)indefatigable
Dutch onvermoeibaar
  • onvermoeibaarindefatigable
Esperanto nelacigebla
  • nelacigeblaindefatigable
Finnish väsymätön, uupumaton
  • väsymätönindefatigable
  • uupumatonindefatigable
French inlassable
  • inlassableindefatigable
German unermüdlich
  • unermüdlichindefatigable
Greek ακούραστος
  • ακούραστος (akoúrastos)indefatigable
Italian instancabile
  • instancabileindefatigable
Japanese 疲れを知らない
  • 疲れを知らない (tsukare o shiranai)indefatigable
Polish niestrudzony, niezmordowany
  • niestrudzonyindefatigable
  • niezmordowanyindefatigable
Portuguese incansável
  • incansávelindefatigable
Russian неутоми́мый, неуста́нный
  • неутоми́мый (neutomímyj)indefatigable
  • неуста́нный (neustánnyj)indefatigable
  • безуста́нный (bezustánnyj)indefatigable
Spanish incansable, infatigable
  • incansableindefatigable
  • infatigableindefatigable
Turkish yorulmak bilmeyen
  • yorulmak bilmeyenindefatigable
Ukrainian невто́мний
  • невто́мний (nevtómnyj)indefatigable

Rhymes & wordplay

Anagrams

riteless
Cite this entry
APA

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

MLA

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

Chicago

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

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