perniciousness
per·ni·cious·ness
noun
1.
grave harmfulness or deadliness
Origin
From pernicious + -ness.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.