- infatigable (adj.)
[infatigable 词源字典]
- c. 1500, from French infatigable (15c.), from Latin infatigabilis, from in- "not, opposite of" (see in- (1)) + fatigabilis, from fatigare "to weary" (see fatigue).[infatigable etymology, infatigable origin, 英语词源]