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In some senses, numskull is marked as derogatory. Watch for register when choosing this word.
NUMSKULL + NOUN
clyde
ADV.
such
noun
A dunce, mentally dull or stupid person.
A person who refuses to learn or grow mentally.
That numskull will never learn how to compose a letter.
noun — a stupid person
That numskull will never learn how to compose a letter.
WiktionaryThat's not how you do it, you numskull!
Tatoeba · #7247889Don't be such a numskull, Clyde.
Tatoeba · #8781010i Register
In some senses, numskull is marked as derogatory. Watch for register when choosing this word.