tireless

Adjective
  1. Showing sustained enthusiastic action with unflagging vitality (synset 300878228)
    "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"
    similar to: energetic - possessing or exerting or displaying energy
    same as: indefatigable, unflagging, unwearying
  2. Characterized by hard work and perseverance (synset 300758203)
    similar to: diligent - characterized by care and perseverance in carrying out tasks
    same as: hardworking, industrious, untiring

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