indefatigable

  • (s) showing sustained enthusiastic action with unflagging vitality
    • an indefatigable advocate of equal rights
    • a tireless worker
    • unflagging pursuit of excellence
    tireless, unflagging, unwearying,

Synonyms

tireless unflagging unwearying

Words of close approximity

indefatigably
indefatigably
indefatigableness