- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
55 entries under stiff topic. ×
| concrete(adjective, set, hard, tough, solid) | |
| crowded(adjective, close, set, solid, heavy) | |
| inflexible(adjective, set, strong, hard, tough) | |
| rigid(adjective, set, strong, hard, tough) | |
| strong(adjective, close, set, hard, secure) | |
| callous(adjective, set, hard, firm) | |
| compacted(adjective, set, strong, hard, firm) | |
| concentrated(adjective, set, hard, tough, firm) | |
| consolidated(adjective, close, set, firm, solid) | |
| hardened(adjective, set, strong, hard, tough) | |
| solidified(adjective, set, hard, tough, solid) | |
| caked(adjective, set, solid, heavy, deep) | |
| clabbered(adjective, set, solid, heavy, deep) | |
| clotted(adjective, set, solid, heavy, deep) | |
| coagulated(adjective, set, solid, heavy, deep) | |
| congealed(adjective, set, hard, tough, solid) | |
| curdled(adjective, set, solid, heavy, deep) | |
| fixed(adjective, set, solid, heavy, short) | |
| gelatinous(adjective, set, solid, heavy, deep) | |
| gloppy(adjective, set, solid, heavy, deep) |
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| APA | Smart Define. (2015). impenetrable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, impenetrable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>. |
| MLA | Smart Define. "impenetrable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms> |