Adjectives

(s)atrocious, frightful, horrifying, horrible, uglyprovoking horror“an atrocious automobile accident”, “a frightful crime of decapitation”, “an alarming, even horrifying, picture”, “war is beyond all words horrible” (Winston Churchill), “an ugly wound”
(s)frightful, terrible, awful, tremendousextreme in degree or extent or amount or impact“in a frightful hurry”, “spent a frightful amount of money”
(s)fearful, frightfulextremely distressing“fearful slum conditions”, “a frightful mistake”