Synonyms for Appalling:

adj.

all (adjective)
dismaying.
awful (adjective)
awful, unpleasant, horrible, dire, horrid, terrible, ghastly, repulsive, dreadful, alarming, frightful, hideous.

n.

fearsome, formidable, tremendous, fear, redoubtable, scary. appalling (noun)
dismaying, alarming.

Other synonyms:

disgraceful, fearsome, scary, vile, detestable. redoubtable, horrendous. tremendous, formidable.

Usage examples for appalling

  1. The look she gave, the attitude she took, the appalling gesture which she made, supplied the place of language. – Hand and Ring by Anna Katharine Green
  2. The roar of the fire was appalling – Jess of the Rebel Trail by H. A. Cody
  3. Loud sobs alone broke the appalling silence. – The Revolt of The Netherlands, Complete by Frederich Schiller