fey
touched
crazyish
loony
deranged
potty
off the rails
one brick short of a full load
insano
semihysterical
not wise
sillyish
lunatical
mad as a March hare
gone fishing
off one's onion
off one's rocker
off the beam
nutzoid
wackily
insane in the membrane
nuttily
semimadness
balmily
dottily
loony tunes
unglued
daftly
mad as a fish
perplexing
wildering
anserous
bugnuts
half-cracked
bananapants
meshuggener
hatstand
bughouse
lunatically
off one's chump
crackers
phantom
nutso
nutsy
loco
not right in the head
spreckled
sill
ridicularity
lunately