n. 1. An eccentric or crazy person; an oddball. [ PJC ]
2. (Baseball) A baseball pitch that curves in the direction opposite to that of a curve ball. [ PJC ]
adj. 1. Eccentric; zany; crazy; as, screwball antics; a screwball comedy. [ PJC ]
2. Ridiculously unsound; improbable or doomed to failure; -- of plans or ideas; as, a screwball plan to raise cocoanuts in Alaska. [ PJC ]