'Dreadfulness' definitions:

Definition of 'dreadfulness'

From: WordNet
noun
A quality of extreme unpleasantness [syn: awfulness, dreadfulness, horridness, terribleness]

Definition of 'Dreadfulness'

From: GCIDE
  • Dreadfulness \Dread"ful*ness\, n. The quality of being dreadful. [1913 Webster]