nutsy
nerts
cray-cray
loco
banoodles
bammy
jiggy
wiggy
cray
crazypants
buggish
gaga
loced out
bananapants
off the beam
gone fishing
crazy-ass
off one's rocker
off one's onion
nutzoid
meshuggener
not right in the head
hatstand
half-cracked
bughouse
crackers
bananas
nutso
off one's chump
loony tunes
insane in the membrane
three stops short of Dagenham
get one's freak on
becraze
gobaloon
crazy as a shithouse rat
toppy
out of one's mind
off one's head
go ham
wackadoo
go potty
whacked-out
becrazed
demented
bugnuts
loony
deranged
crazy as a cootie
lose one's mind
off the rails
insano
potty
crazy as a cootie bug
nutcake
radge
fruit
nutball
certifiable
madhead
loopy
nut
jimjam
semimadness
nut-bar
cracked as an egg
not have both oars in the water
plumb crazy
freakazoid
mad as a March hare
dumb out
up the wall
cracky
craziness
nertz
not wise
mad as a cut snake
lunatical
crazen
crazily
screwy
crazyish
nutballs
freeping
phrenesis
tonto
5150
wild-ass
yabble
go mad
cooked
cuckoo for Cocoa Puffs
cuckoo
chaoticity
nutbar
tapped
up the pole