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Adjective: tireless  tI(-u)r-lus
  1. Showing sustained enthusiastic action with unflagging vitality
    "a tireless worker";
    - indefatigable, unflagging, unwearying
     
  2. Characterized by hard work and perseverance
    "These tireless people must have higher income";
    - hardworking, industrious, untiring

See also: diligent, energetic

Encyclopedia: Tireless