not honest

lying, untruthful

not loyal (to a person, one's country etc)

unfaithful

disloyal

disloyal

guilty of mutiny; rebellious

rebellious

deceitful; faithless

treacherous

a person who changes her or his political or religious beliefs and joins a rival group

rebellious

deceitful; keeping or doing things secretly

clever, devious

secret; vague

sly

false or disloyal (to a friend, cause etc); dangerous, severe

dishonest, disloyal

not true (to one's duty, a promise etc); committing adultery

disloyal, adulterous

false; disloyal

dishonest