Definition of "knuckleball" []

• A pitch thrown with the ball gripped on the fingertips and released with no rotation which travels over an unpredictable path to the plate due to micro-turbulence in the air. (noun)
• An event that is hard to predict. (noun)
• To pitch knuckleballs. (verb)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "League Championship Series, Wakefield's knuckleball is still dancing."
• ""The knuckleball is one of the toughest balls to hit," said"
• "Wakefield throws a knuckleball, which is indeed extremely unpredictable. — cephyn"