Simple Definition of smarty-pants

from our Learner's Dictionary

smarty-pants

noun

ˈsmɑɚtiˌpænts How to pronounce smarty-pants (audio)
informal + disapproving : a person who talks and behaves like someone who knows everything
Don't be such a smarty-pants. [=know-it-all]

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“Smarty-pants.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/smarty-pants. Accessed 16 Apr. 2026.

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