not all there (?.)
- abnormal
- arrested
- babbling
- backward
- bereft of reason
- blithering
- brainsick
- burbling
- crackbrained
- cracked
- crazed
- crazy
- cretinistic
- cretinous
- daft
- deluded
- demented
- deprived of reason
- deranged
- disoriented
- distraught
- dithering
- driveling
- drooling
- flighty
- half-baked
- half-witted
- hallucinated
- idiotic
- imbecile
- imbecilic
- insane
- irrational
- loco
- lunatic
- mad
- maddened
- manic
- maundering
- mazed
- mental
- mentally defective
- mentally deficient
- mentally handicapped
- mentally retarded
- meshuggah
- mongoloid
- moon-struck
- moronic
- non compos
- non compos mentis
- not right
- odd
- of unsound mind
- off
- psycho
- queer
- reasonless
- retarded
- senseless
- sick
- simple
- simpleminded
- simpletonian
- slobbering
- stark-mad
- stark-staring mad
- strange
- subnormal
- tetched
- touched
- unbalanced
- unhinged
- unsane
- unsettled
- unsound
- wandering
- witless
