Adjective screwball has 1 sense
  1. crazy, half-baked, screwball, softheaded - foolish; totally unsound; "an impractical solution"; "a crazy scheme"; "half-baked ideas"; "a screwball proposal without a prayer of working"
    Antonym: practical (indirect, via impractical)
,Noun screwball has 2 senses
  1. crackpot, crank, nut, nut case, nutcase, fruitcake, screwball - a whimsically eccentric person
    --1 is a kind of eccentric, eccentric person, flake, oddball, geek
  2. screwball - a pitch with reverse spin that curves toward the side of the plate from which it was thrown
    --2 is a kind of
    pitch, delivery
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