01 a. Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, inde…
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1.
Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, indefatigable exertions, perseverance, application.“Upborne with indefatigable wings.” — Milton.
Syn.
Unwearied; untiring; persevering; persistent.