Synonyms|185Antonyms|49|Broader|0Narrower|0Related|5
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uncareful(adjective, certain)
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uneducated(adjective, dull, careless, indifferent)
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unguarded(adjective, certain)
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unintelligent(adjective, dull, careless, indifferent)
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unobservant(adjective, dull, careless, indifferent)
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unsuspicious(adjective, bold)
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unwatchful(adjective, bold)
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unwise(adjective, certain)
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weary(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>