wacky 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. ludicrous, foolish
   "gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books"
   cockamamie  cockamamy  goofy  sappy  silly  wacky  whacky  zany