Indefatigable
//ˌɪn.dɪˈfæt.ɪ.ɡə.bəl// adj, name
adj, name ·Moderate ·College level
Definitions
Adjective
- 1 Extremely persistent and untiring.
"[...] But he was at the ſame Time an excellent Scholar, and moſt indefatigable in teaching the two Lads."
Adjective
- 1 showing sustained enthusiastic action with unflagging vitality wordnet
Proper Noun
- 1 Synonym of Santa Cruz, an island of Galapagos, Ecuador.
Antonyms
All antonymsExample
More examples"My grandfather is an indefatigable worker."
Etymology
Etymology 1
From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + dēfatīgō (“to tire out”).
Etymology 2
Named by the British Admiralty in honor of the HMS Indefatigable.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.