terrible, terrifying, terrific, eerie, dreadful, dire

sinister, terrible, fearful, ghastly

scary, spooky, fearsome, terrible, frightful, horrible

atrocious, terrible, eerie, awful, horrible, diabolical

shocking, terrifying, devastating, terrific, direful, terrible

dire, terrible, direful, deuced, scary, spooky

rigorous, hard, adamant, adamantine, austere, terrible

terrible, Deadly, Egregious, eldritch, macabre, terrific

terrible, heinous, dire, dismal, frightfully, helnously