"screwball" in the noun sense
1. crackpot, crank, nut, nut case, fruitcake, screwball
a whimsically eccentric person
2. screwball
a pitch with reverse spin that curves toward the side of the plate from which it was thrown
"screwball" in the adjective sense
1. crazy, half-baked, screwball, softheaded
foolish totally unsound
"a crazy scheme"
"half-baked ideas"
"a screwball proposal without a prayer of working"
Source: WordNet® (An amazing lexical database of English)
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