Search Result for "frightfulness": 
Wordnet 3.0

NOUN (1)

1. the quality of being frightful; 



The Collaborative International Dictionary of English v.0.48:

Frightfulness \Fright"ful*ness\, n.
   The quality of being frightful.
   [1913 Webster]


WordNet (r) 3.0 (2006):

frightfulness
    n 1: the quality of being frightful