Meshuggah is a Yiddish word meaning crazy or insane. There are several synonyms that can be used in place of this word. Some alternatives include unhinged, wacky, mad, deranged, batty, nutty, loony, cuckoo, and bonkers. These words all describe someone or something that is not in a stable or rational state. They can be used in various contexts, from describing a person's behavior to a situation that is chaotic or unpredictable. It is important to choose the appropriate synonym based on the intended tone and context of the sentence. Regardless of which word is used, they all convey a sense of craziness or madness.