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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
That extends to Watson himself, who is portrayed as a master of deductive reasoning, a swaggering know-it-all who has a genius-like understanding of human nature and the world itself. Nina Metz, Chicago Tribune, 12 Feb. 2025 Similarly, Satya Nadella’s cultural transformation of Microsoft—shifting from know-it-alls to learn-it-alls—puts a gigantic spotlight on the power of empathetic leadership, one that can be used to ignite cultural shifts to fuel innovation. Dan Pontefract, Forbes, 7 Jan. 2025 She’s encountered everything from misguided but well-intentioned curiosity about her disability to bullies and know-it-alls who ask her where her glasses are. Angela Haupt, TIME, 6 Jan. 2025 Successful teams today aren’t led by the know-it-all and always right A-type personalities. John Hall, Forbes, 22 Dec. 2024 See All Example Sentences for know-it-all

Word History

First Known Use

1873, in the meaning defined above

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

Browse Nearby Words

Cite this Entry

“Know-it-all.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know-it-all. Accessed 3 Mar. 2025.

Kids Definition

know-it-all

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

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