INDEFATIGABLE (OR TIRELESS) (Adj.)

Meaning- able to work or continue for a longtime without becoming tired.

Synonym- DILIGENCE, ASSIDUOUS, LABORIOUS, INDUSTRIOUS

Uses-

•          He had courage, a vivid sense of duty and an indefatigable love for work.
•          He was indefatigable in four years of his editorship in contributing on a great variety of subjects.
•          He has been an indefatigable advocate for reform.