A know-it-all person
(Informal, former) A saucy, rude child
A person regarded as annoyingly self-assertive, especially for making impudent displays of knowledge.
(Slang) A wiseacre or wiseguy
(Slang) Incriminating information or evidence:
A person regarded as being disagreeably egotistical and self-assured.
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, know-it-all, saucebox, smarty, smart aleck, wise guy, malapert, wisenheimer, good and wiseacre.