know-it-all

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈnəʊitɔːl/US:USA pronunciation: respellingUSA pronunciation: respelling(nō′it ôl′)


WordReference Random House Learner's Dictionary of American English © 2026
ˈknow-it-ˌall,  n. [countable]
  1. a person who acts as though he or she knows everything.

WordReference Random House Unabridged Dictionary of American English © 2026
know-it-all  (nō′it ôl′),USA pronunciation n. 
  1. a person who acts as though he or she knows everything and who dismisses the opinions, comments, or suggestions of others.

adj. 
  1. of or characteristic of a know-it-all.
  • 1930–35

'know-it-all' also found in these entries (note: many are not synonyms or translations):
baveux - know-all - mister - smart ass

Forum discussions with the word(s) "know-it-all" in the title:


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