| 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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| flaccid | (adjective) drooping without elasticity; wanting in stiffness | - |
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| (adjective) out of condition; not strong or robust; incapable of exertion or endurance | Synonyms: flabby, soft |
| lucid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, limpid, luculent, pellucid, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, limpid, pellucid, transparent |
| (adjective) capable of thinking and expressing yourself in a clear and consistent manner | Synonyms: coherent, logical |
| (adjective) having a clear mind | - |
| nonviscid | (adjective) not resembling glue in texture | Synonyms: nonglutinous |
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| pellucid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, limpid, lucid, luculent, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, limpid, lucid, transparent |
| 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 |
| rancid | (adjective) smelling of fermentation or staleness | Synonyms: sour |
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| (adjective) (used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition | - |
| subacid | (adjective) slightly sour to the taste | - |
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| viscid | (adjective) having the sticky properties of an adhesive | Synonyms: gluey, glutinous, gummy, mucilaginous, pasty, sticky, viscous |
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