indefatigably

/ˌɪndɪˈfætɪɡəbli/
adverb
  1. In a way that shows tireless persistence or never giving up.
    • The scientist indefatigably pursued a cure for the disease for over twenty years.
    • She worked indefatigably to raise money for the local animal shelter.
    • He indefatigably practiced the piano every day until he mastered the piece.
Antonyms
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