defatigable

Latin defatigatus, past participle of defatigare (“to tire or weary”).

• (UK) IPA^(key): [dɪˈfætɪɡəbəɫ]

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defatigable (comparative more defatigable, superlative most defatigable)

1. (very rare) Easily tired or wearied; capable of being fatigued.
   • 2001: Cleveland Amory, The Cat Who Came for Christmas

     The author wishes to acknowledge the help of his peerful editor, Fredrica Friedman, and his defatigable researcher, Susan Hall, as well as that of his severest critic, P. Bear.

   • 1994 July 25, Jack Winter, “How I met my wife”, in The New Yorker:

     The conversation become more and more choate, and we spoke at length to much avail. But I was defatigable, so I had to leave at a godly hour.

• Websters 1902.