nailbiter

/N EY1 L B AY0 T ER0/
noun
  1. 1

    One who bites or chews his or her fingernails

  2. 2

    A nervous or uncomfortable situation

    โ€œIt was a real nail biter waiting for the test results.โ€

  3. 3

    An engaging or exciting cliffhanger.

Source: https://en.wiktionary.org/wiki/nail%20biter, https://en.wiktionary.org/wiki/nailbiter