Synonyms and related words :
balefulness, banefulness, deadliness, detrimentalness, fatality, harmfulness, hurtfulness, injuriousness, malignance, malignancy, malignity, mischievousness, mortality, noisomeness, noxiousness, ominousness, perniciousness, poisonousness, toxicity, unhealthiness, venomousness, viciousness, virulence