treasonist
/ˈtrizənɪst/
noun
- A person who commits treason against their country.
- History books often label the rebel leader as a treasonist.
- The court sentenced the treasonist to life in prison for plotting against the government.
- The king declared anyone who helped the invaders a treasonist.
- A person who betrays a group, cause, or person's trust.
- The club expelled the member as a treasonist after he stole funds.
- In the office, he was known as a treasonist for leaking private emails.
- She called him a treasonist for abandoning their shared project at the last minute.