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In some senses, dumbness is marked as dated, offensive, informal. Watch for register when choosing this word.
dumbness
noun 4
Definitions
noun
1
The state of being mute: that is, of not communicating vocally, whether from selective mutism (refusal to speak) or from an inability to speak.
He was a deaf-mute. His dumbness did not seem to matter when we were boys.
2
Muteness, silence; abstention from speech.
There was speech in their dumbness.
3
Show or gesture without words; pantomime; dumb-show.
To the dumbness of the gesture one might interpret.
4
The quality of being stupid or foolish.
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