General:
* Amusing
* Humorous
* Comical
* Hilarious
* Side-splitting
* Rib-tickling
* Wacky
* Quirky
* Droll
* Whimsical
* Clever
* Witty
* Entertaining
* Hilarious
* Laugh-out-loud
Satirical/Sarcastic:
* Ironical
* Cynical
* Subversive
* Mockery
* Parody
* Satire
Silly/Absurd:
* Goofy
* Zany
* Daft
* Ludicrous
* Outlandish
* Farcical
* Ridiculous
Informal:
* Chuckle-worthy
* Hilar
* Cracking
* Hilarious
* Lol-worthy
* Funny as hell
* A riot
* A gas
Descriptive:
* Pithy (short and witty)
* Dry (subtle humor)
* Sharp (intelligent humor)
* Deadpan (humor delivered with a serious face)
* Black (dark humor)
* Crude (vulgar humor)
The best word to use will depend on the specific context and the type of humor you are trying to describe.