dissimulator
/dɪˈsɪmjəˌleɪtər/
noun
- A person who hides or disguises their true feelings, thoughts, or intentions.
- The con artist was a skilled dissimulator who fooled many people.
- In the novel, the villain is a master dissimulator who pretends to be a friend.
- She was a natural dissimulator, able to keep a straight face while lying.