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By the way, "dumb" means unable to speak, or mute. Using "dumb" as a synonym for stupid is as offensive as using "retarded" as a synonym for idiotic. Which, in my opinion, is not at all.

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The words idiot, imbecile and so on used to have a technical meaning of someone landing in a specific IQ range. Idiotic is a synonym of retarded.

"Mentally retarded" used to be a medical term too. They just renamed it to "intellectual disability" after "retarded" became more widely used as a slur. https://en.m.wikipedia.org/wiki/Intellectual_disability

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