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Discover LudwigThe word "know-it-all" is correct and usable in written English
You can use it to refer to someone who acts like they know everything or pretend to know more than they actually do. Example sentence: She's such a know-it-all; she always has to be right.
Dictionary
Know-it-all
noun
Someone who obnoxiously claims to be knowledgeable on a subject.
synonyms
Exact(25)
EDWARD SNOWDEN: Know-it-all.
Being a know-it-all.
BRIAN WILLIAMS: Know-it-all?
He is not a know-it-all.
Except for the know-it-all.
Anyone who says they know it all is, well, a know-it-all.
Similar(34)
Do we know it all in detail?
I don't know it all.
I don't have to know it all.
They know it all too well.
I know: it all sounds unbelievable.
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CEO of Professional Science Editing for Scientists @ prosciediting.com