In`de*fat"i*ga*ble (?), a. [L. indefatigabilis: cf. OF. indefatigable. See In- not, and Defatigable, and cf. Infatigable.]
Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, indefatigable exertions, perseverance, application.
"A constant,
indefatigable attendance."
South.
Upborne with indefatigable wings.
Milton.
Syn. -- Unwearied; untiring; persevering; persistent.
© Webster 1913.