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A person regarded as annoyingly self-assertive, especially for making impudent displays of knowledge.
[Perhaps after Aleck Hoag, 19th-century American confidence man and thief.]
smart′-al′eck, smart′-al′eck·y (-ĭ-kē) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Informal. Rude and disrespectful:
assuming, assumptive, audacious, bold, boldfaced, brash, brazen, cheeky, contumelious, familiar, forward, impertinent, impudent, insolent, malapert, nervy, overconfident, pert, presuming, presumptuous, pushy, sassy, saucy, smart.
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.