150 entries under indifferent topic. ×

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wimpy(adjective, unconcerned, uncaring, passive)
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could care less(expression, adjective, idiom, unconcerned)
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hard as nails(expression, adjective, idiom, set, hard)
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blind(adjective, unsympathetic, inattentive, uninterested)
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blithe(adjective, unsympathetic, inattentive, uninterested)
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bloodless(adjective, unkind, unresponsive, heartless)
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bored(adjective, unconcerned, listless, uninterested)
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carefree(adjective, nonchalant, undisturbed, undaunted)
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carefree apathetic(expression, unsympathetic, inattentive, uninterested)
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dispirited(adjective, unconcerned, listless, uninterested)
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droopy(adjective, unconcerned, listless, uninterested)
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easy(adjective, unsympathetic, inattentive, uninterested)
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feckless(adjective, unsympathetic, inattentive, uninterested)
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forgetful(adjective, unsympathetic, inattentive, uninterested)
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lazy(adjective, unconcerned, listless, uninterested)
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negligent(adjective, unsympathetic, inattentive, uninterested)
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relaxed(adjective, unsympathetic, inattentive, uninterested)
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resolute(cold, unyielding)
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staunch(cold, unyielding)
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steadfast(cold, unyielding)
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APASmart Define. (2016). callous thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/callous/thesaurus/synonyms
ChicagoSmart Define. 2016. "callous thesaurus" https://smartdefine.org/callous/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, callous thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/callous/thesaurus/synonyms>.
MLASmart Define. "callous thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/callous/thesaurus/synonyms>