Synonyms of terrifying

1 Syllable
grim
2 Syllables
ghoulish, grisly, sickie, horrid, scary, ghastlier, creepier, lurid, ghastly, awful, hideous, creepy, grabber
3 Syllables
alarming, gruesome, harrowing, truculent, fearsome, nightmarish, traumatic, appalling, horrible, hair-raising, bloodcurdling
4 Syllables
awesome
5 Syllables
intimidating