"phony person" is grammatically correct and can be used in written English.
It refers to someone who is insincere, fake, or deceitful. Example: The businessman was known to be a phony person, always putting on a friendly facade but only looking out for his own interests.
You disgusting, emotionless, phony person @realDonaldTrump.
"She is being the phony person that she is".
Think about yourself as a person, not the phony person you acted like in your Common App essay, but a real individual.
Addressing the media crunch that had gathered outside the church during the private ceremony, Leolah Brown said that the funeral "was wonderful until Pat started speaking.… She is being the phony person that she is".
Your boyfriend is with you because he likes you, not some phony person that you're trying to be.
Julie is a phony, insensitive person.
For days I hide behind texts about how insanely busy I am, but we have a date to listen to an old friend who's singing at a Times Square club, and I can't pull off phony excuses in person.
For the most part, everyone (ladies included) can tell a phony from a genuine person, so trying to act like someone you're not or conceal your true feelings will just lead to mutual feelings of awkwardness.
He told them to work across the aisle but also warned against becoming trapped by "phony bipartisanship," as one person described his remarks.
It may all be phony nostalgia for a person too young to know the reality directly, but these men describe an age of innocence motivated by simple love for the game.
Creepiness suggests unknown potential: the creepy person may appear so phony, or so mistuned to social constraints, that we don't know what he could do.
