| hurtful(adjective, hard, nasty, tender, intelligent) | |
| malevolent | |
| nasty(adjective, severe, sharp, harsh, rude) | |
| penetrating(adjective, strong, hard, severe, sharp) | |
| pithy(adjective, sarcastic) | |
| rough(adjective, sarcastic) | |
| short(adjective, severe, discourtesy) | |
| snappish(adjective, keen, sharp, unpleasant, lively) | |
| sulfurous | |
| sulphurous | |
| tedious(adjective, tender, raw, painful, sickness) | |
| testy(adjective, keen, sharp, unpleasant, lively) | |
| troublesome(adjective, sickness, ache, anguishes) | |
| vicious(adjective, hard, negative, critical, spiteful) | |
| abrupt(adjective, severe) | |
| antagonistic(adjective, mean, severe, sharp, nasty) | |
| barbed(adjective, strong, sharp, nasty, unpleasant) | |
| bearish(adjective, irritable) | |
| chemical | |
| choleric(adjective, keen, sharp, lively) |
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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> |