Adjective screwball has 1 sense
- 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)
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Noun screwball has 2 senses
- crackpot, crank, nut, nut case, nutcase, fruitcake, screwball - a whimsically eccentric person
--1 is a kind of eccentric, eccentric person, flake, oddball, geek
- 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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