perniciousness

per·ni·cious

P0202000 (pər-nĭsh′əs)adj.1. Tending to cause death or serious injury; deadly: a pernicious virus.2. Causing great harm; destructive: pernicious rumors.

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[Middle English, from Old French pernicios, from Latin perniciōsus, from perniciēs, destruction : per-, per- + nex, nec-, violent death; see nek- in Indo-European roots.]

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per·ni′cious·ly adv.per·ni′cious·ness n.

Thesaurus

Noun

1.

perniciousness - grave harmfulness or deadliness toxicityunwholesomeness, morbidness, morbidity - the quality of being unhealthful and generally bad for you