Synonyms for Terrify:

n.

shake up, chill, frighten/scare the wits out of someone. fear, fright, scarify, scare the daylights out of, startle. shock (noun)
study at frighten.
terrify (noun)
terrorise, terrorize.

v.

emotion (verb)
terrorise, terrorize.
frighten (verb)
disturb, set on edge, agitate, harrow, petrify, horrify, panic, threaten, rattle, alarm, haunt, intimidate, frighten, unnerve, scare.
scare (verb)
fright, frighten, intimidate, chill, terrorize, alarm, petrify, startle, horrify.

Other synonyms:

shake up. startle. chill. fright. frighten
petrify, scarify.
haunt
harrow.
Other relevant words:
fright, terrorize, startle, terrorise, scarify, scare the daylights out of, fear, chill.

Usage examples for terrify

  1. They had probably learned from the servant at the inn that her aunt was out, and had thought they could terrify her into doing their pleasure, and setting food and drink before them. – Tom Tufton's Travels by Evelyn Everett-Green
  2. You terrify me, Captain, with your ominous hints about compulsion. – The Passing of Ku Sui by Anthony Gilmore
  3. The young man still sought to terrify him into compliance. – Fletcher of Madeley by Frederic W. Macdonald