upstart
/ˈʌp.stɑɹt/ adjective C2- Acting like a parvenu.
- Self-important and presumptuous.
From the library
They are destined for each other by the voice of every member of their respective houses; and what is to divide them?--the upstart pretensions of a young woman without family, connections, or fortune!
You would be no longer a lost child found, but you would be looked upon as an upstart, who had sprung up like a mushroom in the night.
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