adjective
- incapable of being tired out; not yielding to fatigue; untiring.
adjective
- unable to be tired out; unflagging
1630s, from indefatigable + -ity.
1580s (implied in indefatigably), from French indefatigable (15c.), from Latin indefatigabilis “that cannot be wearied,” from in- “not” (see in- (1)) + defatigare “to tire out,” from de- “utterly, down, away” + fatigare “to weary” (see fatigue).