Etymology
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ninny (n.)

"simpleton, fool," 1590s, perhaps a misdivision of an innocent (see N for other examples), or from the pet form of the proper name Innocent, with sense influenced by the name's literal meaning. There may be some influence in the word of Italian ninno "baby, child" (cognate with Spanish niño). Related: Niniversity "school for idiots" (1580s).

updated on June 25, 2019

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Definitions of ninny from WordNet

ninny (n.)
a stupid foolish person;
Synonyms: nincompoop / poop
From wordnet.princeton.edu, not affiliated with etymonline.