Virulency

1. (n.) The quality or state of being virulent or venomous; poisonousness; malignancy.

2. (n.) Extreme bitterness or malignity of disposition.

Thesaurus Entries

balefulness, banefulness, bitchiness, communicability, contagiousness, cussedness, deadliness, despite, destructiveness, detrimentalness, devilment, devilry, deviltry, evil intent, fatality, grudge, harmfulness, hatefulness, hurtfulness, ill will, infectiousness, infectivity, iniquitousness, injuriousness, invidiousness, lethality, maleficence, malevolence, malice, malice aforethought, malice prepense, maliciousness, malignance, malignity, meanness, mischievousness, mortality, nastiness, noisomeness, noxiousness, ominousness, orneriness, perniciousness, poison, poisonousness, spite, spitefulness, spleen, toxicity, unhealthiness, venom, venomousness, viciousness, virulence, virulency, wickedness