Definition of terrifying:
dreadful, ghastly, frightful, redoubtable, fantastic, direful, horrible, terrific, scary, marvellous, spine-chilling, spooky, formidable, howling, fearsome, grand, awesome, marvelous, wondrous, forbidding, tremendous, dire, shocking, wonderful, eerie, alarming, menacing, dread, terrible, chilling, hair-raising, horrendous.
- "An Antarctic Mystery", Jules Verne.
Every night she had dreams, but tonight they were almost exclusively sad in character, and so terrifying that she woke herself repeatedly with her own groaning, or disturbed Arsinoe's peaceful sleep by loud cries.- "The Complete Historical Romances of Georg Ebers", Georg Ebers.
Sometimes such a dread is the result of some terrifying incident, as the case in my notes in which the treasurer of a university developed an intense dread of the dark which made sleep impossible without a light, after he had been shot at by a burglar who came into his room and who answered his demand, " Who is that?"- "Health Through Will Power", James J. Walsh.