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indefatigable (adj.)
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" (see de-) + fatigare "to weary" (see fatigue (n.)).
Blount's "Glossographia" (1656) has defatigable, which also was in use elsewhere in 17c., but the modern use of defatigable (1948) probably is a jocular back-formation from indefatigable.
updated on July 09, 2018
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Dictionary entries near indefatigable
indeclinable
indecorous
indecorum
indeed
indefatigability
indefatigable
indefeasible
indefensible
indefinability
indefinable
indefinite