Main entry: screwball
Definition: a pitch with reverse spin that curves toward the side of the plate from which it was thrown
Main entry: crackpot, crank, screwball, fruitcake, nut, nut case
Definition: a whimsically eccentric person
Main entry: half-baked, softheaded, screwball, crazy
Definition: foolish; totally unsound
Usage: a crazy scheme; half-baked ideas; a screwball proposal without a prayer of working