| sour | (adjective) having a sharp biting taste | - |
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| (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, glum, moody, morose, saturnine, sullen |
| (adjective) inaccurate in pitch | Synonyms: false, off-key |
| (adjective) smelling of fermentation or staleness | Synonyms: rancid |
| (adjective) in an unpalatable state | Synonyms: off, turned |
| (adjective) one of the four basic taste sensations; like the taste of vinegar or lemons | - |
| soured | (adjective) having turned bad | - |
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| sourish | (adjective) tasting sour like a lemon | Synonyms: lemonlike, lemony, tangy, tart |
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