General:
* Funny
* Amusing
* Comic
* Witty
* Entertaining
* Jocular
More specific:
* Satirical: Using humor to criticize or expose foolishness.
* Wry: Using humor that is dry and understated.
* Facetious: Using humor that is lighthearted and playful, sometimes bordering on flippant.
* Ribald: Using humor that is bawdy and vulgar.
* Farcical: Using humor that is absurd and exaggerated.
The best synonym will depend on the context and the specific type of humor you are trying to describe.