counterfeit, fake, pretend, pretender, false, impostor, pseud, assumed, feign, dissemble, more...

genuine, authentic, real, genuine article

fake, counterfeit, imitation, phony, fraud, hoax, charlatan, imposter, more...

mere, hollow, complete, ash, empty, pure, miserable, total, pretentious, greatest, much

phony deal,   a false form,   phony proposal,   fake fight,   fake relationship,   not what it appears,   bogus thing,   forced fake,   fake marriage,   fake attempt