knuckleball
/ˈnʌkəlˌbɔl/
noun
- A type of pitch in baseball thrown with little spin, causing the ball to move unpredictably.
- Catching a knuckleball is one of the hardest jobs in baseball.
- He spent years perfecting his knuckleball to make it harder to hit.
- The pitcher's knuckleball danced in the air, confusing the batter.