Synonyms|648Antonyms|154|Broader|16Narrower|18Related|740

56 entries under adjective topic. ×

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inadvertent
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indolent
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insensitive
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lightheaded
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listless
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nonchalant
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perfunctory
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reckless
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scatty
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slipshod
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sloppy
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slovenly
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unconcerned
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undiscriminating(careless, unobservant)
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vacant
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wanton
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APASmart Define. (2016). observant thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/observant/thesaurus/antonyms
ChicagoSmart Define. 2016. "observant thesaurus" https://smartdefine.org/observant/thesaurus/antonyms (accessed September 28, 2026).
HarvardSmart Define 2016, observant thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/observant/thesaurus/antonyms>.
MLASmart Define. "observant thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/observant/thesaurus/antonyms>