General:
* Nonsense
* Rubbish
* Balderdash
* Poppycock
* Tripe
* Fudge
* Hogwash
* Bosh
* Fake
* Fraud
More sarcastic or critical:
* Claptrap
* Moonshine
* Hot air
* Guff
Specific to dishonesty:
* Deception
* Trickery
* Charlatanism
* Quackery
The best synonym will depend on the specific meaning and tone you want to convey.