1) Addlepated 2) Around the bend 3) Balmy 4) Barmy 5) Bats 6) Batty 7) Bonkers 8) Buggy 9) Cracked 10) Crackers 11) Crazy in the coconut 12) Crazy or eccentric 13) Daft 14) Eccentric 15) English girl name 16) Feeble or unsteady in gait 17) Feeble-minded 18) Fruity 19) Haywire 20) Infatuated with spots 1) Balmy 2) Bats 3) Batty 4) Bonkers 5) Buggy 6) Crackers 7) Daft 8) Enamored 9) Gaga 10) Haywire 11) Infatuated 12) Insane 13) Kookie 14) Kooky 15) Loco 16) Loony 17) Loopy 18) Loving 19) Nuts 20) Senile 
• (a.) Unsteady in gait; hence, feeble; half-witted. • (a.) Composed of, or characterized by, dots.
Dot'ty adjective [ From 2d Dot .] 1. Composed of, or characterized by, dots. 2. [ Perh. a different word; confer Totty .] Unsteady in gait; hence, feeble; half-witted. [ Eng.] 
Dotty is slang for feeble-minded; slightly crazy.
crazy or eccentric. · feeble or unsteady in gait. · very enthusiastic or infatuated (usually fol. by about or over).