Insincere
Part of speech: adjective
Definition: not sincere not serious
Example sentence: I just don't like people coming up to me and saying something. It immediately makes you become insincere. There is no way you can react to it sincerely.
Feigned
Part of speech: verb
Definition: To make a false show or pretence of; to counterfeit or simulate.
Part of speech: adjective
Definition: Pertaining to a pretense, a counterfeit, or something false or fraudulent.