| inordinate(adjective, fancy, severe, unreasonable, extreme) | |
| set in stone(adjective, determined, resolute, obstinate, uncompromising) | |
| squiffy | |
| stringent(adjective, hard, severe, rough, difficult) | |
| tiddly | |
| unconscionable(adjective, severe, big, usual, unreasonable) | |
| vigorous(adjective, strong, pleasant, severe, solid) | |
| besotted | |
| cockeyed | |
| crocked | |
| exacting(adjective, hard, tough, severe, rough) | |
| fuddled | |
| graceless(adjective, hard, firm, rude, coarse) | |
| hearty(adjective, tenacious) | |
| heavy(adjective, set, hard, tough, severe) | |
| immoderate(adjective, fancy, severe, unreasonable, extreme) | |
| inelegant(adjective, informal, awkward, tasteless, crude) | |
| lifeless(adjective, dull, slow, informal, cold) | |
| prudish(adjective, informal, shy, strict, particular) | |
| rough(adjective, hard, severe, difficult, harsh) |
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| APA | Smart Define. (2015). stiff thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, stiff thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff thesaurus" 24 December 2015. Web. 22 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms> |