Synonyms|903Antonyms|221|Broader|12Narrower|16Related|2.1k
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ardent
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arduous
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argus-eyed
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awake
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be up on(quiet, careless)
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beholden
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bound up(expression, mean, cool, cold, indifferent)
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burning
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buttoned up(expression, clear, careless)
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cagey
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calculating
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canny
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civil
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clammed up(expression, clear, careless)
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close
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cognizant
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coldblooded(careless, thoughtless)
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conservative
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costive
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delicate
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APASmart Define. (2016). heedless thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/heedless/thesaurus/antonyms
ChicagoSmart Define. 2016. "heedless thesaurus" https://smartdefine.org/heedless/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2016, heedless thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/heedless/thesaurus/antonyms>.
MLASmart Define. "heedless thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/heedless/thesaurus/antonyms>