cuckoo
jimjam
noninsane
half-cracked
wild-ass
out of one's box
off one's tree
out of one's tree
out of one's gourd
off one's box
go potty
take leave of one's senses
lunatical
insanity
lose one's mind
nonsane
mad as a March hare
loony tunes
off-minded
insane in the membrane
unsane
becrazed
one brick short of a full load
bugs
nonsanity
nerts
cuckoo for Cocoa Puffs
fruitloop
apartments to let
sick-ass
craziness
bananapants
crazyitis
nutzoid
off one's onion
psycho
off the beam
unmad
off one's rocker
gone fishing
bananas
pop one's cork
toys in the attic
frontal lobeless
flooey
demented
gelt
lunatically
mooner
mad as a fish
rocket
insane
meshuga
stunod
mad
get one's freak on
meshuggeneh
meshuggener
meshugga
nutso
meshugge
go moggy
cracked as an egg
crazy as a pet coon
loon
cooked
fey
mad as a mongoose
mad as a hatter
touched
non compos mentis
gonzo
nutballs
loopy
crack up
poke
not right in the head
not have both oars in the water
semimadness
go mad
toppy
bubbleheaded
phrenesis
chumpish
plumb crazy
insaneness
three stops short of Dagenham
insanability
dementia
cracky
fatuitous
half-wit
crazyquilting
up the wall
maddening