noun
a person of obscure origin who has gained wealth, influence, or position
adjective
relating to or characteristic of a parvenu
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The parvenu tried to fit in with the aristocracy by hosting extravagant parties.
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The parvenu is always showing off his new wealth.
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That parvenu is such a wannabe.
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In the world of art, the parvenu is often seen as an outsider trying to break into the established circles.