Word.ws English Dictionary

indefatigably

US/ˌɪndəˈfætəɡəbli/

indefatigably adverb: in an extremely persistent and untiring manner; in an indefatigable manner.

Adverb

indefatigably (comparative more indefatigably, superlative most indefatigably)

  1. In an extremely persistent and untiring manner; in an indefatigable manner
    • Silence, silence,’ the trumpet mouths indefatigably repeated at intervals down every corridor.1932, Aldous Huxley, Brave New World, London: Chatto & Windus

Forms of indefatigably

comparativemore indefatigably
superlativemost indefatigably

Origin of indefatigably

From indefatigable + -ly, but indefatigable itself was attested later. In use since the 16th century.

Questions about indefatigably

What does indefatigably mean?
Indefatigably means in an extremely persistent and untiring manner; in an indefatigable manner.
What part of speech is indefatigably?
Indefatigably is an adverb.
How do you pronounce indefatigably?
Indefatigably is pronounced /ˌɪndəˈfætəɡəbli/ (US).

Words near indefatigably in the dictionary

  1. indefaceable
  2. indefatigabilities
  3. indefatigability
  4. indefatigable
  5. indefatigableness
  6. indefatigably
  7. indefatigation
  8. indefeasibility
  9. indefeasible
  10. indefeasibleness
  11. indefeasibly

Source and license

Adapted from Wiktionary: indefatigably (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “indefatigably.” Word.ws, https://word.ws/indefatigably. Based on Wiktionary, CC BY-SA 4.0.