tireless
Definitions
Having or showing great effort or energy; untiring.
Continuing at a steady, persistent pace without becoming exhausted.
Examples
The tireless volunteers worked through the night to provide relief to the flood victims.
She is a tireless advocate for animal rights and spends every weekend at the shelter.
His tireless dedication to the project finally resulted in a major scientific breakthrough.
Synonyms
indefatigable unflagging relentless persistent diligent assiduous unwearied