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Adjective: indefatigable  ,in-di'fa-tu-gu-bul
  1. Showing sustained enthusiastic action without obvious tiredness
    "an indefatigable advocate of equal rights";
    - tireless, unflagging, unwearying

See also: energetic

Encyclopedia: Indefatigable

Nearest

indecision
indecisive
indecisively
indecisiveness
indecorous
indecorously
indecorousness
indecorum
indeed
indefatigability
indefatigable
indefatigableness
indefatigably
indefeasible
indefectible
indefensible
indefensibly
indefinability
indefinable
indefinably
indefinite