knuckleball

/N AH1 K AH0 L B AO0 L/
noun
  1. 1

    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.

    Boston Red Sox pitcher Tim Wakefield is best known for his use of the knuckleball.

  2. 2

    An event that is hard to predict.

    Our vendor keeps throwing us knuckleballs.

verb
  1. 1

    To pitch knuckleballs.

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Source: https://en.wiktionary.org/wiki/knuckleball