The Collaborative International Dictionary of English v.0.48:
Ghastliness \Ghast"li*ness\, n. The state of being ghastly; a deathlike look. [1913 Webster]WordNet (r) 3.0 (2006):
ghastliness n 1: the quality of being ghastly [syn: ghastliness, grimness, gruesomeness, luridness]