Non compos mentis
Else clues• ___ -tunes: nuts
• Bananas
• Bananas or nuts
• Bats
• Bonkers
• Certifiable, so to speak
• Cockamamie
• Considerably less than all there
• Crackers
• Crazy
• Crazy in the head
• Cuckoo
• Daft
• Foolish
• Harebrained
• Inane
• Kind of bin
• Kind of tune
• Kook
• Mad
• Mad as a hatter
• Meshuga
• Nonsensical
• Not all there
• Not sane
• Off one's rocker
• Off-the-wall
• One brick shy of a load
• Out to lunch
• Preposterous
• Round the bend
• Senselessly foolish
• Touched
• Tunes preceder
• Unhinged
• Very foolish
• Wacked out
• Wacko
• What some thought Columbus was
• Someone deranged and possibly dangerous