screw·ball 
(skrbôl′)
(skrbôl′)n.
1. Baseball A pitched ball that curves in the direction opposite to that of a normal curve ball.
2. Slang An eccentric, impulsively whimsical, or irrational person.
adj.
Slang
Slang
Impulsively whimsical; eccentric: That screwball proposal won't work.
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