a wise person: often used facetiously or contemptuously
Word origin
C16: from Middle Dutch wijsseggher soothsayer; related to Old High German wīssaga, German Weissager. See wise1, say
wiseacre in American English
(ˈwaɪzˌeɪkər)
noun
a person who makes annoyingly conceited claims to knowledge
Word origin
altered by folk etym. < MDu wijssegger, altered (infl. by wijs, wise1 + zeggen, to say) < OHG wissago, altered (infl. by wis, wise1 + sago, speaker < sagen, to say) < wizzago, prophet < Gmc *witag-, knowing: for IE base see wise1