General:
* Betray
* Mislead
* Trick
* Hoodwink
* Dupe
* Swindle
* Con
* Defraud
* Cheat
* Misrepresent
* Delude
* Bamboozle
More formal:
* Beguile
* Dissemble
* Obfuscate
* Prevaricate
More informal:
* Pull a fast one
* Take for a ride
* Do a number on
The best synonym will depend on the context and the specific nuance you want to convey.