Phony (adjective)

1. Not genuine; fraudulent.
2. Insincere or affected.

Origin:

Late 19th century: of unknown origin; perhaps related to fawn.

Examples:

1. He was caught with a phony ID.
2. She had a phony accent.
3. The painting was a phony.
4. He was a phony friend.
5. The story was a phony.