not genuine

counterfeit

done secretly; kept secret

secret, sly

(of a person, action) immoral; dishonest

dishonest

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

fake, simulated

showing skill in trickery of the deceit

clever, scheming

often deceiving

dishonest, insincere

deceiving

dishonest

going round and not taking the direct way

dishonest, crafty

not honest

lying, untruthful

difficult to find, capture etc; not easy to remember

evasive, mysterious

a work of art etc that looks genuine but is not

false, imitation

(of an argument etc) wrong because based on error

false, wrong

an act of pretending

imagined, unreal

untruthful

dishonest

not real or genuine; to make fun of (a person, way of speaking etc) (especially by copying in an unkind or disrespectful way)

artificial, fake

(to make) the cry of a duck; a person dishonestly claiming to have medical knowledge and skill

counterfeit

to pretend (to be in the condition mentioned)

artificial, counterfeit

not to be trusted

deceitful, untrustworthy

(of actions) done secretly

sneaky, secret

deceitful(ly)

deceitful