What do you call a person who cannot speak

Answers:
an idiot

Correction: People who cannot or who do not speak are said to be "mute."
The word "dumb" is an older term for "mute," which shows up in the now-reviled expression "deaf and dumb" (does not hear or speak) and in the old term for silent movies and for a show in pantomime: "dumb show."

In the days when terms such as idiot, imbecile, and moron were official designations for people of low intelligence, an "idiot" was technically a "feeble minded" person whose mental age did not exceed three and who would not, therefore, have had much speech, if any at all.
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