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

Time Traveler for know-it-all

Time Traveler

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

See more words from the same year

Dictionary Entries Near know-it-all

know-how

knowing

know it

know-it-all

knowledgable

knowledge

knowledgeable

See More Nearby Entries 

Statistics for know-it-all

Cite this Entry

“Know-it-all.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know-it-all. Accessed 26 Jul. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

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

More from Merriam-Webster on know-it-all

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

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

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

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!