a person who possesses or affects to possess great wisdom.

1585–95; < Middle Dutch wijssager prophet, translation of Middle High German wīssage, late Old High German wīssago, by popular etymology equivalent to wīs wise + sago sayer, from earlier wīzzago wise person; cognate with Old English wītega, akin to wit2

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World English Dictionary
wiseacre (ˈwaɪzˌeɪkə)
1.  a person who wishes to seem wise
2.  a wise person: often used facetiously or contemptuously
[C16: from Middle Dutch wijsseggher soothsayer; related to Old High German wīssaga, German Weissager. See wise1, say]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1595, partial translation of M.Du. wijssegger "soothsayer" (with no derogatory connotation), probably altered by association with M.Du. segger "sayer" from O.H.G. wizzago "prophet," from wizzan "to know," from P.Gmc. *wit "know." The depreciatory sense of "one who pretends to know everything" may have
come through confusion with obsolete Eng. segger "sayer," which also had a sense of "braggart" (c.1440).
Online Etymology Dictionary, © 2010 Douglas Harper
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