a person who acts as though they know everything and who dismisses the opinions, comments, or suggestions of others.
of or characteristic of a person who acts as though they know everything and who dismisses the opinions, comments, or suggestions of others.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use know-it-all in a sentence
He made an easy target, the know-it-all liberal egghead who demeaned the wisdom of the American people.
On her own path, though, the “relationship know-it-all” is embracing her own, different natural progression.Confessions of a Rom-Com Writer: Liz Tuccillo Talks ‘Sex and the City,’ ‘Take Care,’ and More | Kevin Fallon | December 5, 2014 | THE DAILY BEAST
In her Twitter profile bio, writer Liz Tuccillo calls herself a “relationship know-it-all.”Confessions of a Rom-Com Writer: Liz Tuccillo Talks ‘Sex and the City,’ ‘Take Care,’ and More | Kevin Fallon | December 5, 2014 | THE DAILY BEAST
Franklin was a printer, scientist, revolutionary, ambassador and all around know-it-all.
He was kind of a know-it-all, talked with a lot of authority on different subjects.Whitey Bulger’s Women: Inside the Terror and Glamour of His Ex-Girlfriends | T.J. English | June 11, 2012 | THE DAILY BEAST
Lewis was one of these stuck-up, know-it-all johnnies, not long breeched.Two on the Trail | Hulbert Footner
"I've a good mind not to tell you, Mr. know-it-all," exclaimed Johnny Chuck.The Adventures of Reddy Fox | Thornton W. Burgess
None of the new girls appeared to be inclined toward a “know-it-all” attitude, for which Jane was grateful.Jane Stewardess of the Air Lines | Ruthe S. Wheeler
They couldn't fool me with their slick off-the-cuff ready-made know-it-all responses!The Capgras Shift | Sam Vaknin
"She is—and she's just what you need," said Sue, with that know-it-all smile of hers.The Harbor | Ernest Poole
Other Idioms and Phrases with know-it-all
see know all the answers.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.