General:
* Funny
* Amusing
* Comical
* Entertaining
* Witty
* Lighthearted
* Jocular
* Droll
More specific:
* Satirical: If the humor is sharp and critical, using irony or exaggeration.
* Wry: If the humor is dry, understated, and slightly cynical.
* Ribald: If the humor is coarse, bawdy, and suggestive.
* Farcical: If the humor is absurd, exaggerated, and often chaotic.
* Subtle: If the humor is understated and requires some effort to appreciate.
* Absurd: If the humor relies on the unexpected and nonsensical.
The best synonym to use will depend on the specific context of your writing.