Antonyms of adj tireless

2 senses of tireless

Sense 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")

INDIRECT (VIA energetic) -> lethargic, unenrgetic -- (deficient in alertness or activity; "bullfrogs became lethargic with the first cold nights")

Sense 2
hardworking, industrious, tireless, untiring -- (characterized by hard work and perseverance)

INDIRECT (VIA diligent) -> negligent -- (characterized by neglect and undue lack of concern; "negligent parents"; "negligent of detail"; "negligent in his correspondence")

Similarity of adj tireless

2 senses of tireless

Sense 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")
       => energetic (vs. lethargic) -- (possessing or exerting or displaying energy; "an energetic fund raiser for the college"; "an energetic group of hikers"; "it caused an energetic chemical reaction")

Sense 2
hardworking, industrious, tireless, untiring -- (characterized by hard work and perseverance)
       => diligent (vs. negligent) -- (characterized by care and perseverance in carrying out tasks; "a diligent detective investigates all clues"; "a diligent search of the files")