1 falsify, doctor, alter, modify, counterfeit, fabricate, manufacture, forge:
He faked the evidence in order to implicate his own sister.
2 pretend, make a pretence of, dissemble, feign, sham, make believe, simulate, affect:
She faked a headache to avoid gym classes.
3 hoax, counterfeit, sham, forgery, imitation, Colloq phoney or US also phony:
The experts agree that the painting is a fake.
4 faker, impostor, charlatan, fraud, hoaxer, mountebank, cheat, humbug, quack, pretender, Colloq phoney or US also phony:
He isn't a doctor - he's a fake!
5 false, counterfeit, forged, sham, fraudulent, imitation, pinchbeck, bogus, spurious, factitious, Colloq phoney or US also phony:
He escaped the country using a fake passport.