Webster
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Webster’s Revised Unabridged Dictionary · 1913

Nincompoop

Nin′com·poop (nĭn′kŏm·po͞op), n. [A corruption of non compos.] A fool; a silly or stupid person. [Law]

An old ninnyhammer, a dotard, a nincompoop, is the best language she can afford me. Addison.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.