- Definitions|0
- Thesaurus|626
- Abbreviations|0
54 entries under callous topic. ×
| tough(adjective, strong, hard, sound, continue) | |
| hard(adjective, set, strong, tough, continue) | |
| obdurate(adjective, strong, hard, tough, firm) | |
| stony(adjective, set, strong, hard, indifferent) | |
| aloof(adjective, hard, tough, firm, indifferent) | |
| bloodless(adjective, hard, indifferent, unkind, unresponsive) | |
| case-hardened(adjective, unfeeling, stubborn, hardened) | |
| cold fish(expression, adjective, tough, harsh, cruel) | |
| coldblooded(adjective, severe, grim, unfeeling, bleak) | |
| coldhearted(adjective, hard, indifferent, unfeeling, unkind) | |
| cruel(adjective, strong, hard, tough, vicious) | |
| feelingless(adjective, hard, indifferent, unfeeling, unkind) | |
| hard-as-nails(adjective, determined, serious, persistent) | |
| hard-boiled(adjective, hard, tough, harsh, indifferent) | |
| hardened(adjective, set, strong, hard, tough) | |
| hardhearted(adjective, hard, indifferent, unfeeling, unkind) | |
| heartless(adjective, feeling, hard, cold, indifferent) | |
| imperceptive(adjective, hard, indifferent, unkind, unresponsive) | |
| incurious(adjective, hard, indifferent, unkind, unresponsive) | |
| insensitive(adjective, hard, tough, indifferent, cruel) |
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| APA | Smart Define. (2015). hard as nails thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/hard_as_nails/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hard as nails thesaurus" https://smartdefine.org/hard_as_nails/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, hard as nails thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>. |
| MLA | Smart Define. "hard as nails thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms> |