- Definitions|1
- Thesaurus|758
- Abbreviations|0
| firm | |
| frigid | |
| frosted | |
| frosty | |
| frozen | |
| grave | |
| hard(adjective, careless, indifferent, cruel, apathetic) | |
| hard-bitten(adjective, hard, careless, indifferent, cruel) | |
| hard-boiled(noun, adjective, hard, careless, indifferent) | |
| hard as nails(expression, adjective, idiom, hard, indifferent) | |
| hardened to(expression, safe, unaffected, protected, resistant) | |
| hardhearted(adjective, hard, careless, indifferent, cruel) | |
| icy | |
| immovable | |
| immune to(expression, adjective, dead, insensitive, insusceptible) | |
| immunised | |
| immunized | |
| immutable | |
| impenitent(adjective, hard, careless, indifferent, cruel) | |
| imperceptible(adjective, cold, indifferent, unresponsive, numb) |
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| APA | Smart Define. (2015). unsusceptible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unsusceptible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unsusceptible thesaurus" https://smartdefine.org/unsusceptible/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, unsusceptible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unsusceptible/thesaurus/synonyms>. |
| MLA | Smart Define. "unsusceptible thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/unsusceptible/thesaurus/synonyms> |