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She is an indefatigable worker who never takes a break.
Always active and never getting tired.
He is an indefatigable athlete who trains every day.
The indefatigable volunteers worked tirelessly for the charity.
Her indefatigable spirit inspires everyone around her.
indefatigable spirit
indefatigable effort
indefatigable energy
tireless
unflagging
unwearied