Smart-aleck
noun
1.
an obnoxiously conceited person.
2.
a wise guy.
noun (pl) smart alecks
1.
(informal) an irritatingly oversmart person
smarmy
An impudent or obnoxiously self-assertive individual, a wise guy, as in New teachers often have a hard time coping with the smart alecks in their classes. This expression, dating from the mid-1800s, probably alluded to a person of this description who was named Alec or Alexander, but his identity has been lost.
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- Smartass
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adjective 1. Also, smart-assed, smartassed. characteristic of a smart ass or wise guy. noun 2. smart ass. noun, Slang: Sometimes Vulgar. 1. a wise guy; know-it-all. smart aleck