wacky wacky /ˈwæki/

adjective

1. () Ludicrous, foolish  ( goofy [Informal] , whacky , zany , silly , wacky )
   ludicrous, foolish
    Wore a goofy hat
   wore a goofy hat
    A silly idea
   a silly idea
    Some wacky plan for selling more books
   some wacky plan for selling more books
   
2. Informal or slang terms for mentally irregular  ( around the bend , balmy , barmy , bats , batty , bonkers , buggy , cracked , crackers , daft , dotty , fruity , haywire , kookie , kooky , loco , loony , loopy , nuts , nutty , round the bend , wacky , whacky )
   informal or slang terms for mentally irregular
    It used to drive my husband balmy
   it used to drive my husband balmy