Is there a word for a person who believes themselves to be smarter than others, but frequently betrays that the opposite is true. For example, when dumb-shaming someone, this person uses their big words incorrectly, but confidently. Know-it all isn't quite right, because there's a chance a know-it-all might actually know quite a lot.
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egotist noun. TFD
A conceited, boastful person.
An egotist is a self-absorbed, bragging person. From Latin: ego = I.
As in:
Toby, vigilant about his diet and insecure about his height, is persuasive as a well-meaning egotist. The New YorkerJun 27, 2019
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This word is not about professing knowledge, which 'know-it-all' is. – Mitch Oct 21 '19 at 13:28