WordWeb Online

1. Foolish; totally unsound
   "a screwball proposal without a prayer of working";
   - crazy, half-baked [informal], softheaded, wiggy [US, informal], crackpot [informal], nutty [informal]

1. [informal] A whimsically eccentric person
   - crackpot [informal], crank, nut [informal], nutcase [informal], fruitcake [informal]
    
2. A pitch with reverse spin that curves toward the side of the plate from which it was thrown

Derived forms: screwballs

See also: impractical

Type of: dag [Austral, NZ, informal], delivery, eccentric, eccentric person, flake [N. Amer, informal], geek [informal], oddball [informal], pitch

Encyclopedia: Screwball