simpleton, jackass, nitwit; see fool 1.
"numskull." YourDictionary, n.d. Web. 17 January 2019. <https://thesaurus.yourdictionary.com/numskull>.
numskull. (n.d.). Retrieved January 17th, 2019, from https://thesaurus.yourdictionary.com/numskull
A mentally dull person:
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