| resentful(adjective, severe, nasty, hostile, sulky) | |
| rigorous(adjective, severe) | |
| rude(adjective, hostile, belligerent, quarrelsome) | |
| salty(adjective, mean, strong, evil, sharp) | |
| savage(adjective, hostile, belligerent, quarrelsome) | |
| short-tempered | |
| spicy(adjective, strong, keen, sharp, powerful) | |
| splenetic(speech, unfriendly, bitter, belligerent, spiteful) | |
| tangy(adjective, strong, sharp, unpleasant, powerful) | |
| terse(adjective, sarcastic) | |
| acidulent | |
| amaroidal | |
| antacid | |
| austere(adjective, mean, severe, sharp, nasty) | |
| bad(adjective, sharp, unpleasant, bitter, sour) | |
| bad-tempered(adjective, mean, sharp, harsh, cross) | |
| belligerent(adjective, mean, sharp, harsh, cross) | |
| catenary | |
| cauterizer | |
| conchoid |
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| APA | Smart Define. (2015). caustic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/caustic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "caustic thesaurus" https://smartdefine.org/caustic/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, caustic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/caustic/thesaurus/synonyms>. |
| MLA | Smart Define. "caustic thesaurus" 21 July 2015. Web. 22 September 2026. <https://smartdefine.org/caustic/thesaurus/synonyms> |