Answer: loony

AnswerCrossword Clue
LOONYSoft in the head
LOONYVery foolish
LOONYInane
LOONYCrazy
LOONYMeshuga
LOONYCrazy like a bird.
LOONYPixilated.
LOONY"Who's ... now?"
LOONYDaffy.
LOONYGoofy
LOONYKind of bin
LOONYTetched
LOONYType of bin
LOONYCuckoo
LOONYTouched
LOONYCockamamie
LOONYOut to lunch
LOONYSenselessly foolish
LOONYOff-the-wall
LOONYKind of tune
LOONYNot sane
LOONYBananas, crackers or nuts
LOONYHarebrained
loonya lunatic or a foolish person
loonya crazy person, also LOONEY, LOONIE, LUNY / crazy (insane (mentally unsound))
loonyextremely foolish
loonyinsane
LOONYBats
LOONYMad as a hatter
LOONYWacko
LOONYBananas
LOONYCracked
LOONYPreposterous
LOONYNon compos mentis
LOONYConsiderably less than all there
LOONYOff one's rocker
LOONYOne brick shy of a load
LOONYCertifiable, so to speak
LOONYMad
LOONYNuts