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Definition of indefatigable:

  1. Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, indefatigable exertions, perseverance, application.

Synonyms:

untiring, industrious, unwearying, tireless, unwearied, active, unwearied, continue, unfailing, energetic, inexhaustible, weariless, hardworking, unflagging, tired.

Usage examples: