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Adjective: indefatigable  `in-di'fa-tu-gu-bul
  1. Showing sustained enthusiastic action with unflagging vitality
    "an indefatigable advocate of equal rights"
    - tireless, unflagging, unwearying

See also: energetic, indefatigableness

Encyclopedia: Indefatigable

Nearest

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indecisive
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indeed
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