Related Clues:

• Not all there
• Feeble-minded
• Touched
• Ridiculously odd
• Very strange
• A bit crazy
• Absurdly impractical
• A bit eccentric
• Slightly mad
• Slightly eccentric
• Not sane in spots
• Not 10 across, by way of a full stop
• You'd be mad to get so dashy, perhaps, with Morse
• Dorothy is a bit of a nut
• Very peculiar