(guilty) of adultery

unfaithful

(of a person, action) immoral; dishonest

dishonest

(to make) (something) made or done in imitation of another thing in order to deceive

fake, simulated

often deceiving

dishonest, insincere

deceiving

dishonest

not honest

lying, untruthful

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

unfaithful

outside the regular course of academic work or studies

unfaithful

disloyal

disloyal

not sincere

dishonest, pretended

of lie, lie

dishonest

deceitful; faithless

treacherous

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

dishonest, disloyal

deceitful(ly)

deceitful

not ethical

dishonest, immoral

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

disloyal, adulterous

not patriotic

disloyal

without moral principles; dishonest

corrupt

not caring about being honest or doing wrong

immoral

false; disloyal

dishonest

not trustworthy

not dependable, unfaithful