| 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 | - |
| 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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