Definition of tireless

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tire·less    (trls) KEY 

ADJECTIVE:

Not yielding to fatigue; untiring or indefatigable.

OTHER FORMS:
tireless·ly(Adverb), tireless·ness(Noun)

SYNONYMS:
tireless, indefatigable, unflagging, untiring, unwearied, weariless

These adjectives mean having or showing a capacity for prolonged and laborious effort: a tireless worker; an indefatigable advocate of human rights; unflagging pursuit of excellence; untiring energy; an unwearied researcher; a weariless defender of freedom of the press.