indefatigable

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indefatigable¹

  • /ˌɪn.dɪˈfæt.ɪ.ɡə.bəl/ UK
  • /ˌɪn.dəˈfæt.ɪ.ɡə.bəl/ Australia, US
  • [ˌɪn.dəˈfæɾ.ɪ.ɡə.bəl] Australia, US
  • /ˌɪn.dɪ.fəˈti.ɡə.bəl/ proscribed, sometimes
  • /ˌɪn.də-/ proscribed, sometimes

Where it comes from

From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + dēfatīgō (“to tire out”).

adjective more indefatigable · most indefatigable

  1. Extremely persistent and untiring. [...] But he was at the ſame Time an excellent Scholar, and moſt indefatigable in teaching the two Lads.

    Similar: inexhaustible, relentless, tireless, unflagging, unsinkable, untiring, unwearying · Opposite: defatigable

Indefatigable²

Where it comes from

Named by the British Admiralty in honor of the HMS Indefatigable.

proper noun

  1. Synonym of Santa Cruz, an island of Galapagos, Ecuador.

    Similar: Santa Cruz

Translations

Every language

adj extremely persistent and untiring

Españolincansable, infatigable
中文不倦 bùjuàn
Portuguêsinfatigável
Françaisinfatigable
Deutschunermüdlich
Italianoinfaticabile
Ελληνικάακούραστος akoúrastos
Русскийнеутоми́мый neutomímyj, неуста́нный neustánnyj, упо́рный upórnyj
العربيةلَا يَتْعَبُ lā yatʕabu
עבריתלא מתעיף la' mth'if

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Cite this
MLA

"indefatigable." Wiktionary, via Micwyn, micwyn.com/word/indefatigable. Accessed 6 Nov. 2026.

APA

indefatigable. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/indefatigable

Chicago

"indefatigable." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/indefatigable.

BibTeX
@misc{indefatigable_2026,
  title = {indefatigable},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/indefatigable},
  urldate = {2026-11-06}
}