Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: Early French indéfatigable, from Latin indefatigabilis, from fatigare; FATIGUE

indefatigable

 adjective
     
in‧de‧fat‧i‧ga‧ble formal
determined and never giving up:
an indefatigable campaigner for human rights
—indefatigably adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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