| contemptuous(adjective, mean, keen, sharp, critical) | |
| contumelious(adjective, mean, evil, sharp, nasty) | |
| cool(adjective, severe) | |
| deadly | |
| demanding(adjective, severe) | |
| despiteful | |
| disagreeable(adjective, tender, raw, burning, sore) | |
| discontented | |
| double-edged | |
| dour(adjective, severe) | |
| edged(adjective, strong, sharp, intense, powerful) | |
| escharotic | |
| exacting(adjective, severe) | |
| festoon | |
| fierce(adjective, mean, strong, severe, sharp) | |
| frosty(adjective, severe) | |
| hyperbola | |
| icy(adjective, severe) | |
| ill-natured | |
| inflexible(adjective, severe) |
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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> |