know-it-all

noun

Synonyms of know-it-allnext
: 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.
But Tracee Chimo, who plays a bubbly, know-it-all maid, is a standout. Brent Lang, Variety, 20 Apr. 2026 Smart-assed, competent and a bit of a know-it-all, PJ runs his roost like mission control. Rosy Cordero, Deadline, 24 Mar. 2026 In fact, some know-it-all called this race more or less over just a week ago. Glenn Whipp, Los Angeles Times, 2 Mar. 2026 Elsewhere, elites are framed as bureaucratic, academic know-it-alls – and get sucked into the culture war in the process. Alexa Beck, Fortune, 15 Feb. 2026 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 2 May. 2026.

Kids Definition

know-it-all

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

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