| acerb | (adjective) sour or bitter in taste | Synonyms: acerbic, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| drab | (adjective) of a light brownish green color | Synonyms: olive-drab |
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| (adjective) lacking brightness or color; dull | Synonyms: sober, somber, sombre |
| (adjective) causing dejection | Synonyms: blue, dark, dingy, disconsolate, dismal, drear, dreary, gloomy, grim, sorry |
| (adjective) lacking in liveliness or charm or surprise | Synonyms: dreary |
| dumb | (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dim, dull, obtuse, slow |
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| (adjective) unable to speak because of hereditary deafness | Synonyms: mute, silent |
| (adjective) temporarily incapable of speaking | Synonyms: speechless |
| (adjective) lacking the power of human speech | - |
| fab | (adjective) extremely pleasing | Synonyms: fabulous |
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| glib | (adjective) artfully persuasive in speech | Synonyms: glib-tongued, smooth-tongued |
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| (adjective) having only superficial plausibility | Synonyms: pat, slick |
| (adjective) marked by lack of intellectual depth | - |
| numb | (adjective) so frightened as to be unable to move; stunned or paralyzed with terror; petrified | - |
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| (adjective) lacking sensation | Synonyms: asleep, benumbed |
| (adjective) (followed by `to') not showing human feeling or sensitivity; unresponsive | Synonyms: dead |
| plumb | (adjective) exactly vertical | - |
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| prefab | (adjective) manufactured in standard sizes to be shipped and assembled elsewhere | - |
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| scrub | (adjective) (of domestic animals) not selectively bred | - |
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| snub | (adjective) unusually short | - |
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| squab | (adjective) short and fat | Synonyms: squabby |
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| superb | (adjective) surpassingly good | - |
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| (adjective) of surpassing excellence | Synonyms: brilliant |