Indefatigable Definition

ĭndĭ-fătĭ-gə-bəl
adjective
Having or showing a capacity for persistent effort; not tiring or relenting.
American Heritage
That cannot be tired out; not yielding to fatigue; untiring.
Webster's New World
Antonyms:

Origin of Indefatigable

  • Obsolete French indéfatigable from Latin indēfatīgābilis in- not in–1 dēfatīgāre to tire out (dē- intensive pref. de–) (fatīgāre to weary)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + de- (“away”) + fatīgō (“I tire”).

    From Wiktionary

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