Synonyms for Dreadful:

adj.

awful (adjective)
frightful, repulsive, hideous, appalling, alarming, ghastly, horrid, unpleasant, dire, terrible, horrible, awful.
offensive (adjective)
atrocious, offensive, horrid, frightful.
unspeakable (adjective)
unspeakable.

n.

sadly, hopelessly, sorry, utterly, such as it is. formidable, fear, scary, redoubtable. dreadful (noun)
fearsome, dreaded, abominable, alarming, terrible, bad, awful, frightening, dire, horrendous, dread, painful, horrific, unspeakable, direful, unpleasant, atrocious, fearful.
terrible (noun)
offensive, poor.

v.

revolting (verb)
offensive.

Other synonyms:

scary, vile. redoubtable. formidable.

Usage examples for dreadful

  1. He was a dreadful man. – Amusement Only by Richard Marsh
  2. I got awful mad, and I- I said a dreadful word. – Tip Lewis and His Lamp by Pansy
  3. But isn't it dreadful – 'Laramie;' or, The Queen of Bedlam. by Charles King