simpleton, jackass, nitwit; see fool 1.
"numskull." YourDictionary, n.d. Web. 12 October 2018. <http://thesaurus.yourdictionary.com/numskull>.
numskull. (n.d.). Retrieved October 12th, 2018, from http://thesaurus.yourdictionary.com/numskull
A mentally dull person:
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