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The girl is a big phony foracting like she likes evryone, when she really talks bad about them behind their backs.
Phony can be used as an adjective or noun.
Adjective--a phony person
Noun--a bunch of phonies.
The guy pretending to play the piano was a phony. (noun)
The counterfeiter was arrested for printing phony money. (adjective)
She gave a phony excuse for being late to the meeting.