nincompoop
Noun
Meaning
A fool; a silly or stupid person.
Source: Webster's dictionarySynonyms
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Examples
Frank Morgan as the nincompoop King Louis XIII, Angela Lansbury as his intelligent but none too heart-wise Queen and Vincent Price as the always disagreeable Cardinal Richelieu.
But Carmine was so much fun, and I never dreamed I’d get to use the word “nincompoop” in a book.