Mentally strange synonyms | phrases

Phrases with similar meaning for Mentally strange

• screw loose
• nutty as fruitcake
• round the bend
• mad as a hatter
• bats in the belfry
• of unsound mind
• out to lunch
• mad as a March hare
• flipped out
• freaked out
• out-to-lunch
• beyond all reason
• half-baked
• ill-conceived
• out of all reason
• short-sighted