Standard Lemma guide

indefatigably

adv · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • General-American: /ˌɪndəˈfætəɡəbli/

1

adv

Meaning 1

In an extremely persistent and untiring manner; in an indefatigable manner

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adverb

Meaning 2

with indefatigable energy

Definition source: Princeton WordNet 3.0

Examples

  • she watched the show indefatigably

Meaning relationships

Synonyms: tirelessly, inexhaustibly

Antonyms: none provided

History

Etymology

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

Across languages

Translations

4 source translations are retained for this English entry.

  • Czech: neúnavně — in an extremely persistent and untiring manner
  • Macedonian: неу́морност (neúmornost) — in an extremely persistent and untiring manner
  • Macedonian: безу́морност (bezúmornost) — in an extremely persistent and untiring manner
  • Norwegian: utrettelig — in an extremely persistent and untiring manner