a smarty pants

(informal)

someone who is always trying to seem more clever than everyone else in a way that is annoying Cindy, the little smarty pants, will be the first to tell us where we went wrong.

Common Names:

Name	Pronounced	Usage
Dooley	['du:li]
Emmaline	EM-ə-leen	English
Yehu'	-	Biblical Hebrew
Eleutherios	-	Late Greek
Nadya (1)	-	Russian, Bulgarian, Ukrainian
Trevelyan	trə-VEL-yən	English (Rare)