nailbiting

/N EY1 L B AY1 T IH0 NG/
noun
  1. 1

    The habit of biting one's fingernails.

adjective
  1. 1

    That causes nervous anticipation or suspense

Source: https://en.wiktionary.org/wiki/nail%20biting, https://en.wiktionary.org/wiki/nail-biting, https://en.wiktionary.org/wiki/nailbiting