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Children's Dictionary
around the bend (informal) crazy; insane.
cuckoo (slang) crazy or foolish. [1/2 definitions]
insane having a disease of the mind; crazy; mad. [1/2 definitions]
kook (slang) a person considered to be strange or crazy.
mad crazy; insane. [1/6 definitions]
nut (slang) a foolish or crazy person. [1/4 definitions]
rational in control of one's mind; not insane or crazy. [1/3 definitions]
rave to talk in a strange, irrational, or crazy way. [1/2 definitions]
wild crazy; out of control. [1/7 definitions]