Adjective
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extremely distressing
"fearful slum conditions"
"a frightful mistake"
-
extreme in degree or extent or amount or impact
"in a frightful hurry"
"spent a frightful amount of money"
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provoking 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"