thickskull
Noun
Meaning
A dullard, or dull person; a blockhead; a numskull.
Source: Webster's dictionarySynonyms
knucklehead
bullhead
idiot
gudgeon
blockhead
fathead
bonehead
doofus
half-wit
dunderhead
muttonhead
lunkhead
jughead
braindead
chucklehead
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