Synonyms for Suspenseful:

adj.

dramatic (adjective)
tense.
hair-raising (adjective)
cliff-hanging.

n.

classic, abridged, folklore, filmic, autobiographical, biographical, gory, fictional, epic, fictitious. suspenseful (noun)
suspensive, Nail Biting, tense, cliff-hanging.

Other synonyms:

nail-biting
Nail Biting.
Other relevant words:
classic, abridged, folklore, filmic, autobiographical, biographical, gory, fictional, epic, fictitious.