| stringent | |
| strong(adjective, severe, sharp, intense, powerful) | |
| sullen(adjective, tough, harsh, awkward, grumpy) | |
| truculent(adjective, attack, respect) | |
| unpleasant(adjective, sharp, nasty, harsh, disagreeable) | |
| unsavory(adjective, sharp, nasty, unpleasant, disagreeable) | |
| vehement(adjective, strong, intense, powerful, deep) | |
| vituperative | |
| water | |
| wet blanket(expression, idiom, insulation, fire extinction) | |
| California sunshine(noun, expression, drug, dot, candy) | |
| abusive | |
| accurate(sharp, critical, penetrating, meaningful, incisive) | |
| acerbate | |
| acerbity | |
| acetylsalicylic acid | |
| acidify | |
| acidulant | |
| acidulousness | |
| actual cautery |
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| APA | Smart Define. (2015). acid thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/acid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "acid thesaurus" https://smartdefine.org/acid/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, acid thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/acid/thesaurus/synonyms>. |
| MLA | Smart Define. "acid thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/acid/thesaurus/synonyms> |