around the bend
bats
bedlam
bonkers
bughouse
cracked
cranky
cuckoo
daffy
distraught
fay
gaga
goofy
insane
loon
loony
lunatic
mad
scatty
coockoo for coacoa puffs
pchscotic
mentally unstable
insane
mental
bonkers
psychotic
maniacal
eccentric
outrageous
wild
weird
senseless
deranged
loca
mental
physco
ape
barmy
batty
berserk
bonkers
cracked
crazed
cuckoo
daft
delirious
demented
dingy
dippy
erratic
flaky
flipped
flippedout
freakedout
fruity
idiotic
insane
kooky
lunatic
mad
maniacal
mental
moonstruck
nuts
nutty
nutty as a fruitcake
of unsound mind
out of one’s mind
out of one’s tree
outtolunch
potty
psycho
roundthebend
schizo
screwball
screw loose
screwy
silly
touched
unbalanced
unglued
unhinged
unzipped
wacky