insane
abnormal
absurd
aliene
also
ass
balmy
batty
bedlamite
bereft of reason
borderline case
born fool
brainsick
buffoon
clown
crackbrain
crackbrained
cracked
crackpot
crank
crazed
crazy
cuckoo
daft
deluded
dement
demented
demoniac
deprived of reason
deranged
deranged person
ding-a-ling
disoriented
distraught
doodle
egregious ass
energumen
fanatic
fantastic
figure of fun
flake
flighty
fool
fou
hallucinated
harebrain
idiot
criminal
damn
drunken
homicidal
hysterical
irrational
madman
maniac
maniacal
murderous
paranoid
psychotic
sadistic
suicidal