'Frightful' definitions:

Definition of 'frightful'

From: WordNet
adjective
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" [syn: atrocious, frightful, horrifying, horrible, ugly]
adjective
Extreme in degree or extent or amount or impact; "in a frightful hurry"; "spent a frightful amount of money" [syn: frightful, terrible, awful, tremendous]
adjective
Extremely distressing; "fearful slum conditions"; "a frightful mistake" [syn: fearful, frightful]

Definition of 'Frightful'

From: GCIDE
  • Frightful \Fright"ful\, a.
  • 1. Full of fright; affrighted; frightened. [Obs.] [1913 Webster]
  • See how the frightful herds run from the wood. --W. Browne. [1913 Webster]
  • 2. Full of that which causes fright; exciting alarm; impressing terror; shocking; as, a frightful chasm, or tempest; a frightful appearance.
  • Syn: Terrible; dreadful; alarming; fearful; terrific; awful; horrid; horrible; shocking.
  • Usage: Frightful, Dreadful, Awful. These words all express fear. In frightful, it is a sudden emotion; in dreadful, it is deeper and more prolonged; in awful, the fear is mingled with the emotion of awe, which subdues us before the presence of some invisible power. An accident may be frightful; the approach of death is dreadful to most men; the convulsions of the earthquake are awful. [1913 Webster]