indefatigable
adjUK /ˌɪn.dɪˈfæt.ɪ.ɡə.bəl/ · AU, US /ˌɪn.dəˈfæt.ɪ.ɡə.bəl/
Etymology From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + dēfatīgō (“to tire out”).
1
Extremely persistent and untiring.
- [...] But he was at the ſame Time an excellent Scholar, and moſt indefatigable in teaching the two Lads.1749, Henry Fielding, “Containing Two Letters in Very Different Stiles”, in The History of Tom Jones, a Foundling, volume VI, London: A[ndrew] Millar, […], →OCLC, book XVIII, page 196:
- He was respected by all who knew him for his integrity and indefatigable attention to public business.1816 June – 1817 April/May (date written), [Mary Shelley], chapter I, in Frankenstein; or, The Modern Prometheus. […], volume I, London: […] [Macdonald and Son] for Lackington, Hughes, Harding, Mavor, & Jones, published 1 January 1818, →OCLC, page 39:
1 more example
- All night long the Martians were hammering and stirring, sleepless, indefatigable, at work upon the machines they were making ready, and ever and again a puff of greenish-white smoke whirled up to the starlit sky.1895–1897, H[erbert] G[eorge] Wells, “Friday Night”, in The War of the Worlds, London: William Heinemann, published 1898, →OCLC, book I (The Coming of the Martians), pages 54–55:
- Derived terms
- indefatigability, Indefatigable, indefatigableness, indefatigably
- Related terms
- indissuadable