| acid | (adjective) having the characteristics of an acid | - |
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| (adjective) being sour to the taste | Synonyms: acidic, acidulent, acidulous |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| antacid | (adjective) acting to neutralize acid (especially in the stomach) | - |
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| placid | (adjective) (of a body of water) free from disturbance by heavy waves | Synonyms: quiet, smooth, still, tranquil, unruffled |
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| (adjective) not easily irritated | Synonyms: equable, even-tempered, good-tempered |
| subacid | (adjective) slightly sour to the taste | - |
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