know-it-all
noun
a person who acts as though they know everything and who dismisses the opinions, comments, or suggestions of others.
know-it-alls
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pluralof know-it-all.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Soft know-it-alls from the city and phonies of any stripe receive rough treatment in his shows, such as the llama farmer from California who gets thrown under a Montana cattle guard in “Yellowstone.”
From The Wall Street Journal ● Oct. 31, 2025
I like this exercise because it’s not a recounting by news know-it-alls.
From Seattle Times ● Dec. 28, 2023
There are no kitchen table arguments, no drunk know-it-alls pontificating at the numerous pubs, no campaign posters, no red hats, not even a chuckle-worthy moment of political incorrectness from Mare’s mother Helen.
From Slate ● May 27, 2021
Nerdy, yes, but didn’t Aristotle say that “All men” — all human beings — “by nature desire to know”? He might have added that all adolescents are know-it-alls.
From Washington Post ● Nov. 17, 2020
“I don’t think Raven actually hid this book. She’s probably one of those know-it-alls who likes to flaunt every fact in her head. Yippee for you, you know a lot about Edgar Allan Poe.”
From "Book Scavenger" by Jennifer Chambliss Bertman
