know-it-all

noun

: one who claims to know everything
also : one who disdains advice
know-it-all adjective

Examples of know-it-all in a Sentence

Recent Examples on the Web Sagittarius Black Moon Lilith in Sagittarius is a know-it-all who actually does know it all. Lisa Stardust, People.com, 3 Oct. 2024 This outsider’s perspective judges America’s past by the lights of a cynical, know-it-all. Armond White, National Review, 2 Oct. 2024 My 21-year-old grandson is a dramatic and arrogant know-it-all. Jeanne Phillips, The Mercury News, 26 Sep. 2024 Don’t expect Morgan to be some know-it-all, though. Ew Staff, EW.com, 6 Sep. 2024 See all Example Sentences for know-it-all 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'know-it-all.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1873, in the meaning defined above

Time Traveler
The first known use of know-it-all was in 1873

Dictionary Entries Near know-it-all

Cite this Entry

“Know-it-all.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know-it-all. Accessed 11 Oct. 2024.

Kids Definition

know-it-all

noun
ˈnō-ət-ˌȯl
: a person who always claims to know everything

More from Merriam-Webster on know-it-all

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