RichThesaurus
have a screw loose
have a screw loose
synonyms
psychotic
loony
have bats in the/one's belfry
cuckoo
sectionable
unstable
out of one's head
not all there
mad as a March hare
unbalanced
stark raving mad
non compos mentis
yarra
off one's rocker
not (quite) right in the head
insane
loopy
touched
squirrelly
hysterical
have kangaroos in the top paddock
sick in the head
off one's nut
not the full shilling
off one's head
porangi
raving
schizoid
up the pole
stark staring mad
nutty as a fruitcake
not right upstairs
screwy
not in one's right mind
out of one's tree
out of one's mind
off one's trolley
mentally ill
stark mad
lunatic
psychopathic
mental
manic
nutso
meshuga
off the wall
of unsound mind
loco
nutsy
round the twist
more synonyms
have a screw loose
antonyms
sane
sane