* Meshugge (Meshuggah) - This is the most common and versatile word. It's used for someone who is eccentric, outlandish, or simply acting in a way that seems irrational.
* Meshumed - This is a more derogatory term for someone who is considered insane or completely out of their mind.
* Narish - This means "foolish" or "stupid" and can also be used to describe someone who is acting in a foolish or crazy way.
* Kitzur - This literally means "shortened," but it's used idiomatically to describe someone who is quick-tempered, easily angered, and prone to acting impulsively. It can also be used to describe someone who is crazy or unpredictable.
The best word to use depends on the specific context and the level of intensity you want to convey.