παραφρονέωparaphronéō, par-af-ron-eh'-o; from G3844 and G5426; to misthink, i.e. be insane (silly):—as a fool.
Thayer's Greek Lexicon
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STRONGS G3912:
παραφρονέω, παραφρόνω; (παράφρων (from παρά (which see IV. 2) and φρήν, 'beside one's wits')); to be beside oneself, out of one's senses, void of understanding, insane: 2 Corinthians 11:23. (From Aeschylus and Herodotus down; once in the Sept., Zechariah 7:11.)