indefatigable Hear it!

indefatigable definition

in·de·fati·gable (in′di fat′i gə bəl)

adjective

that cannot be tired out; not yielding to fatigue; untiring

Etymology: MFr indéfatigable < L indefatigabilis < in-, not + defatigare, to tire out, weary: see de- & fatigue

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