dotty in WordNet English dictionary

1. informal or slang terms for mentally irregular
   "it used to drive my husband balmy"
   balmy  barmy  bats  batty  bonkers  buggy  cracked  crackers  daft  dotty  fruity  haywire  kooky  kookie  loco  loony  loopy  nuts  nutty  round the bend  around the bend  wacky  whacky 
   
2. intensely enthusiastic about or preoccupied with
   "crazy about cars and racing"; "he is potty about her"
   crazy  wild  dotty  gaga 
   

dotty in English Wiktionary