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[in-di-fat-i-guh-buh l] /ˌɪn dɪˈfæt ɪ gə bəl/

incapable of being tired out; not yielding to fatigue; untiring.
unable to be tired out; unflagging

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” + fatigare “to weary” (see fatigue).


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  • Indefeasible

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  • Indefectible

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