round the bend Synonyms

nutty loony kooky kookie haywire wacky around the bend barmy bats bonkers crackers loco loopy nuts balmy batty buggy cracked fruity daft whacky dotty out of one's head not right in the head nutty as a fruitcake off one's rocker lost your marbles bats in the belfry nutty as fruitcake raving mad up the pole stark raving mad screwy schizo round the twist out to lunch mad as a March hare mad as a hatter crazed cuckoo demented deranged flipped insane mad mental non compos mentis crazy unzipped of unsound mind