smarty-pants
noun
plural smarty-pants
informal
: smart aleck, know-it-all
"If you give people the impression you're a smarty-pants, that's no good for sure."—Al Gore
Choosing books for picky friends can be humbling. There's always one smarty-pants who has read not only the gift book but everything else in the author's oeuvre.—Marilyn Stasio
Even the smartest of smarty-pants couldn't have answered all four of those "gotcha" foreign-policy questions.—Jonathan Alter
smarty-pants
adjective
… a veneer of smarty-pants condescension.
—Ron Powers
Every musical genre has its smarty-pants jokesters, and alternative rock is no exception.
—Entertainment Weekly
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Merriam-Webster unabridged
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