Definition from Wiktionary, the free dictionary
Alternative forms 
- Fraudulent; fake; having a misleading appearance.
- A good jeweler should be able to tell a real stone from a phony one.
Derived terms 
phony (plural phonies)
- A faker, a person who professes beliefs or opinions that they do not hold or assumes an identity other than their own.
- He's such a phony, he doesn't believe half of what he says.