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pretentious
01
attempting to appear intelligent, important, or something that one is not, so as to impress others
02
trying too hard to get attention and impress others
03
(of a display) tawdry or vulgar
Example
Despite his lack of expertise, he used pretentious vocabulary and convoluted arguments in an attempt to appear knowledgeable and impress his colleagues.
Aspiring to impress his date, he took her to a pretentious restaurant known for its excessive prices and elaborate presentation.