General:
* Clownish - This is the most common and straightforward adjective.
* Jester-like - Emphasizes the traditional court jester aspect.
* Comical - Focuses on the humor aspect.
* Ludicrous - Suggests silliness and absurdity.
More specific:
* Farcical - For a clown with exaggerated and silly actions.
* Grotesque - For a clown with a distorted or exaggerated appearance.
* Whimsical - For a clown with a playful and imaginative personality.
* Hilarious - For a clown who makes people laugh uncontrollably.
Negative connotations:
* Ridiculous - Suggests something silly and pointless.
* Unfunny - For a clown who fails to be funny.
* Awkward - For a clown who is clumsy or uncomfortable.
* Disturbing - For a clown that inspires fear or unease.
The best adjective to use will depend on the specific context and the particular type of clown you are describing.