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

fake, simulated

often deceiving

dishonest, insincere

deceiving

dishonest

(of an argument etc) wrong because based on error

false, wrong

based on a false or impossible idea

deceptive

of lie, lie

dishonest

existing only in the imagination and unlikely to happen; (of a person) having grand (and often impossible)

idealized, romantic