6 entries under toughness topic. ×
| hard as nails(expression, idiom) | |
| cold-bloodedness(noun, blood) | |
| brutality | |
| callousness | |
| insensitivity | |
| insouciance |
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| APA | Smart Define. (2016). caring thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/caring/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "caring thesaurus" https://smartdefine.org/caring/thesaurus/antonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, caring thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/caring/thesaurus/antonyms>. |
| MLA | Smart Define. "caring thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/caring/thesaurus/antonyms> |