know-it-all

noun
\ ˈnō-ət-ˌȯl How to pronounce know-it-all (audio) \

Definition of know-it-all

: one who claims to know everything also : one who disdains advice

Other Words from know-it-all

know-it-all adjective

First Known Use of know-it-all

1873, in the meaning defined above

Keep scrolling for more

Learn More about know-it-all

Statistics for know-it-all

Look-up Popularity

Time Traveler for know-it-all

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

See more words from the same year

Keep scrolling for more

More Definitions for know-it-all

know-it-all

noun

English Language Learners Definition of know-it-all

informal + disapproving : a person who talks and behaves like someone who knows everything

know-it-all

noun
\ ˈnō-ət-ˌȯl\

Kids Definition of know-it-all

: a person who always claims to know everything

Keep scrolling for more

More from Merriam-Webster on know-it-all

Rhyming Dictionary: Words that rhyme with know-it-all

Thesaurus: All synonyms and antonyms for know-it-all

Spanish Central: Translation of know-it-all

Nglish: Translation of know-it-all for Spanish Speakers

Comments on know-it-all

What made you want to look up know-it-all? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

formidable, illustrious, or eminent

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!