Etymology
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dumbness (n.)

"inability to speak," Middle English dombenesse, from Old English dumbnes; see dumb (adj.) + -ness. As "stupidity," by 1858.

updated on October 17, 2018

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Definitions of dumbness from WordNet

dumbness (n.)
the quality of being mentally slow and limited;
Synonyms: denseness / slow-wittedness
From wordnet.princeton.edu, not affiliated with etymonline.