tireless

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Adjective tireless has 2 senses

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)
hardworking, industrious, tireless, untiring - characterized by hard work and perseverance
Antonym: negligent (indirect, via diligent)

tired, worn out tired tired of tired worn out tiredest tiredly tiredness tireing tireless tirelessly tirelessness tireness tires tiresias tiresome tiresomely tiresomeness

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