nail-biting

nail-biting
ˈnail-ˌbiting adjective [only before noun]
extremely exciting because you do not know what is going to happen next:
    The match went all the way to a nail-biting finish.
    some nail-biting moments near the end of the movie
     

THESAURUS

   ▪ thrilling /ˈθrɪlɪŋ/ very exciting
   ▪ gripping a gripping film, story etc is very exciting and interesting
   ▪ dramatic used about something that is exciting to watch or hear about as it happens: the dramatic events of the past week
   ▪ exhilarating /ɪɡˈzɪləreɪtɪŋ/ making you feel happy, excited, and full of energy: an exhilarating ride
   ▪ nail-biting very exciting, especially because you do not know what is going to happen next: a nail-biting finish