| unattractive(adjective, bad, nasty, horrible, disagreeable) | |
| uncivil(adjective, severe, bleak, angry, stark) | |
| unpalatable(adjective, bad, nasty, offensive, unpleasant) | |
| unsavoury(adjective, language) | |
| waspish(adjective, difficult, cross, negative, disagreeable) | |
| wistful | |
| acerbity | |
| acescent | |
| acetose(adjective, bitter, altered, acid, tart) | |
| acidulousness | |
| beetle-browed(adjective, sadness, gloom, unclear, sullen) | |
| bellicose(adjective, mean, nasty, unfriendly, irritable) | |
| bilious | |
| clashing(adjective, hard, severe, sharp, flat) | |
| cold(adjective, mean, nasty, hostile, unfriendly) | |
| contrary(adjective, nasty, difficult, cold, hostile) | |
| corrupt | |
| decay(verb, dull, spoil, decompose, ferment) | |
| decayed(adjective, hard, corrupt, disgusting, old) | |
| dissatisfied(adjective, difficult, critical, discontent, discontented) |
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| APA | Smart Define. (2016). sour thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sour/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "sour thesaurus" https://smartdefine.org/sour/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, sour thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sour/thesaurus/synonyms>. |
| MLA | Smart Define. "sour thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/sour/thesaurus/synonyms> |