Poseur (noun)

A person who poses or pretends to be something they are not, often in order to impress others.

Origin:

Early 20th century: french, "one who poses", from poser "to place, put".

Examples:

1. He was a poseur and was always trying to show off his wealth and status.
2. The group didn't trust her because they suspected she was a poseur and not a true member of their community.
3. He was a poseur, he was always trying to fit in with the crowd.
4. She was a poseur, she pretended to be someone she was not.
5. The poseur was always trying to impress others with his fake stories and lies.