Nincompoop definitions

nĭn'kəm-po͝op', nĭng'-
A silly, foolish, or stupid person.
noun
1
0
A stupid, silly person; fool.
noun
1
0
A silly or foolish person.
noun
1
0
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Origin of nincompoop

Earlier (1676) nicompoop, from Latin non compos mentis (“not of sound mind"). The earliest known use of nincompoop spelling is from 1680.