screwball

名词 screwball:

1. a whimsically eccentric person
   同义词：crackpot, crank, nut, nut case, nutcase, fruitcake
2. a pitch with reverse spin that curves toward the side of the plate from which it was thrown

形容词 screwball:

1. foolish; totally unsound
   同义词：crazy, half-baked, softheaded