Synonyms|903Antonyms|221|Broader|12Narrower|16Related|2.1k
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ready
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refined
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reluctant(careless, enthusiastic)
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respectful
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responsive
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rigorous
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risk-averse
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ruminant(state, condition, thought)
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safe and sound
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sagacious
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scheming
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searching
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sedulous
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see to(expression, careless)
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sensible
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sensitive to(expression, uncertain, doubtful, dubious)
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shrewd
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skeptical
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sleepless
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sophic
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APASmart Define. (2016). heedless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/heedless/thesaurus/antonyms
ChicagoSmart Define. 2016. "heedless thesaurus" https://smartdefine.org/heedless/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2016, heedless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/heedless/thesaurus/antonyms>.
MLASmart Define. "heedless thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/heedless/thesaurus/antonyms>