dumb
Speech parts
1. dumb - Adjective
2. dumb - Verb
3. dumb - Adjective Satellite
Meaning
Destitute of the power of speech; unable; to utter articulate sounds; as, the dumb brutes.
Not willing to speak; mute; silent; not speaking; not accompanied by words; as, dumb show.
Lacking brightness or clearness, as a color.
To put to silence.
Source: Webster's dictionarySynonyms
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Examples
so dense he never understands anything I say to him
never met anyone quite so dim
although dull at classical learning, at mathematics he was uncommonly quick
dumb officials make some really dumb decisions
he was either normally stupid or being deliberately obtuse
worked with the slow students