Adjective tireless has 2 senses
  1. indefatigable, tireless, unflagging, unwearying - showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"
    Antonyms: lethargic, unergetic (indirect, via energetic)
  2. hardworking, industrious, tireless, untiring - characterized by hard work and perseverance
    Antonym: negligent (indirect, via diligent)
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