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That isn't stupid nor dumb, but slow as far as mental cognizance goes. Stupid and/or dumb people are those that refuse to learn and/or gain knowledge and perspective when presented with constructive and beneficial information.
Technically "dumb" is the inability for one to speak! However in the vernacular of everyday speech people usually refer to someone who is "slow" to figure out things as being dumb. Thus the old "dumb blonde jokes". Seen the movie Dumb & Dumber?
In everyday speech when people tell their "dumb blonde" jokes they're not referring to someone who refuses to learn or accept evidence. They're referring to someone who is not "bright" or very slow at figuring things out. "The lights are on but.."