(Informal, former) A saucy, rude child
A person regarded as annoyingly self-assertive, especially for making impudent displays of knowledge.
A know-it-all person
A person regarded as being disagreeably egotistical and self-assured.
(Slang) A wiseacre or wiseguy
(Slang) Incriminating information or evidence:
Find another word for smarty-pants. In this page you can discover 11 synonyms, antonyms, idiomatic expressions, and related words for smarty-pants, like: wisecracker, witling, saucebox, smart aleck, wise guy, smarty, malapert, know-it-all, wiseacre, wisenheimer and good.