indefatigable

Meanings

1. 1
   adj

   showing sustained enthusiastic action with unflagging vitality

   An indefatigable advocate of equal rights.

Simplified etymology

Indefatigable is recorded from the early 17th century as the opposite of fatigue. Both belong to the word family derived through French from Latin fatigare, meaning “to tire out.”

From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + dēfatīgō (“to tire out”).

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