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indefatigable

in·de·fat·i·ga·ble

indefatigable

 
 
pronunciation:
In dih fae tih g bl
part of speech: adjective
definition: not subject to fatigue; untiring.
The senator was an indefatigable campaigner and would be hard to beat.
antonyms:
fatigable
similar words:
tireless
derivations: indefatigably (adv.), indefatigability (n.), indefatigableness (n.)