Indefatigable /(ĭn`dē̇*făt"ĭ*gȧ*b'l)/
In·de·fat·i·ga·ble
Indefatigable
a.
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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.