Synonyms|185Antonyms|49|Broader|0Narrower|0Related|5
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indifferent(adjective, dull, careless)
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indiscreet(adjective, dull, careless, indifferent)
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injudicious(adjective, tactless)
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lazy(adjective, dull, careless, indifferent)
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lethargic(adjective, dull, careless, indifferent)
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neglectful(adjective, heedless)
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neglecting(adjective, heedless, tending, commemorative, dedicatory)
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negligent(adjective, dull, careless, indifferent)
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outgoing(adjective, bold)
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rash(adjective, certain)
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reckless(adjective, certain)
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sleepy
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slow(adjective, dull, careless, indifferent)
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sluggish(adjective, dull, careless, indifferent)
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stupid(adjective, dull, careless, indifferent)
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sure(adjective, certain)
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tactless
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thoughtless(adjective, dull, careless, indifferent)
0
unattentive(adjective, heedless)
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unaware(adjective, dull, careless, indifferent)
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APASmart Define. (2015). on the lookout thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/on_the_lookout/thesaurus/antonyms
ChicagoSmart Define. 2015. "on the lookout thesaurus" https://smartdefine.org/on_the_lookout/thesaurus/antonyms (accessed October 1, 2026).
HarvardSmart Define 2015, on the lookout thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/on_the_lookout/thesaurus/antonyms>.
MLASmart Define. "on the lookout thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/on_the_lookout/thesaurus/antonyms>