fake

n. 假货,欺蹒
a. 假的
v. 假造,仿造

That's not a real diamond necklace, it's just a fake!

那不是真钻石项链, 是假的!

He looked like a postman but he was really a fake.

他看上去像个邮递员, 但实际上是假冒的.