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View synonyms for

know-it-all

[ noh-it-awl ]

noun

  1. a person who acts as though they know everything and who dismisses the opinions, comments, or suggestions of others.


adjective

  1. of or characteristic of a person who acts as though they know everything and who dismisses the opinions, comments, or suggestions of others.
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Word History and Origins

Origin of know-it-all1

First recorded in 1930–35
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Idioms and Phrases

see know all the answers .
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Example Sentences

Examples have not been reviewed.

Of course, being a kid is full of trial and error, especially when you’re a know-it-all.

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More than this, it redeems Daniel too, highlighting his transformation from a self-righteous know-it-all into a man who makes peace with some mysteries and finds balance with the man he once tolerated.

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He talks about movies not with a know-it-all territorialism but rather an inclusive camaraderie.

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If we’re paying attention, we might notice that Trump’s undisciplined, self-serving know-it-all behavior has measurable negative consequences.

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Throughout the season Tuck strikes a wonderful balance between Kevin’s know-it-all enthusiasm and the internal bruising he carries due to his inability to fit in.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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