Synonyms|986Antonyms|231|Broader|9Narrower|17Related|1k
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hardboiled
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hardhearted
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hardy
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heartless
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immune to(expression, sensitive)
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impassive
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imperceptive(sensitive, aware)
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imperturbable
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impervious to(expression, sensitive)
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inactive
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inattentive(adjective, calm, cool)
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inconsiderate
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incurious
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intrepid
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iron-hearted
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just watching the clock(expression, idiom, feeling)
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laid back(expression, friendly)
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lax
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lazy
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lighthearted
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APASmart Define. (2016). concerned thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/concerned/thesaurus/antonyms
ChicagoSmart Define. 2016. "concerned thesaurus" https://smartdefine.org/concerned/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2016, concerned thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/concerned/thesaurus/antonyms>.
MLASmart Define. "concerned thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/concerned/thesaurus/antonyms>