What does "nuthouse" mean?

A hospital for the mentally ill.

What is a synonym for "nuthouse"?

Common synonyms include: bedlam, madhouse, asylum, booby hatch, bughouse, chaos.

/ˈnʌtˌhaʊs/ noun, slang

noun, slang ·Moderate ·College level

Noun

1
A hospital for the mentally ill. informal, offensive
"That guy is totally crazy; he belongs in a nuthouse."
2
pejorative terms for an insane asylum wordnet

"Sometimes, I think I'm in a nuthouse."

From nut + house.