Synonyms:
indefatigable, tireless, unflagging, unwearying
Meaning: showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"
Usage examples
But then he said that his tireless fate would bring forth, when the strife lulled for a moment, a man to ask of him an explanation.
And quickly they sighted and sailed past his shrine and the broad banks of the river and the plain, and deep-flowing Calpe, and all the windless night and the day they bent to their tireless oars.