The phrase "false show emotion" refers to an act of pretending one's true feelings by putting on a display of fake emotions. There are various synonyms that can be used to describe this behavior, such as insincerity, hypocrisy, deceit, pretense, and disingenuousness. These words all indicate a lack of authenticity or genuineness in someone's emotional expressions. Some other related terms include affectation, artificiality, and pose, which are also used to describe behavior that is not natural or genuine. Ultimately, false show emotion is a negative trait that undermines trust, sincerity, and honesty in social interactions.