Answer: loonier

AnswerCrossword Clue
LOONIERMore daft
LOONIERMissing more marbles
LOONIERMore cuckoo
LOONIERLess rational
LOONIERMore batty
LOONIERLess mentally sound
LOONIERMore bats
LOONIERMore bananas
loonierLOONIE, crazy (insane (mentally unsound))
looniera lunatic or a foolish person
loonierextremely foolish
loonierinsane