Synonyms for In suspense:

adj.

anxious (adjective)
nervy, jumpy, uptight, jittery.

adv.

on edge (adverb)
high-strung, edgy.

n.

in suspense (noun)
nervy, highly strung, jumpy, edgy, high-strung, tense, jittery, restive, uptight, overstrung.

Other synonyms:

adj.
nervy.