She can disguise her face, but she can never hide that voice.
Adele teamed up with the BBC's Graham Norton to pull the ultimate prank on some unsuspecting Adele impersonators. She transformed into "Jenny": fake chin, fake nose, different makeup and gloves to cover her tattoos. And then she went to an Adele-impersonator audition.
Conclusion: Adele impersonators are really bad at noticing the real Adele. Until she starts singing.