- Definitions|1
- Thesaurus|244
- Abbreviations|0
| firm(difficult, cold, indifferent, troubled, inflexible) | |
| hard as nails(expression, adjective, idiom, hard, impassive) | |
| hardboiled | |
| hardened(hard, insensitive, unsusceptible) | |
| hardhearted(hard, insensitive, unsusceptible) | |
| icebox | |
| immune to(expression, adjective, dead, insensitive, insusceptible) | |
| impasses | |
| imperceptive(adjective, hard, impassive, insensitive, unsusceptible) | |
| impercipient | |
| imperturbable | |
| impervious to(expression, adjective, dead, insensitive, insusceptible) | |
| inactive(adjective, dull, quiet, flat, heavy) | |
| incurious(hard, insensitive, unsusceptible) | |
| inert(adjective, dull, quiet, flat, heavy) | |
| inhospitableness | |
| inviolable | |
| invulnerable | |
| languid(adjective, dull, quiet, flat, heavy) | |
| lumpy(adjective, dull, quiet, flat, heavy) |
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| APA | Smart Define. (2015). impassible thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/impassible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impassible thesaurus" https://smartdefine.org/impassible/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, impassible thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/impassible/thesaurus/synonyms>. |
| MLA | Smart Define. "impassible thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/impassible/thesaurus/synonyms> |