virulence
[U] Uncountable
In a medical sense, this word describes the lethal potency of a pathogen. It suggests a dangerous, aggressive quality that makes a disease particularly difficult to treat or survive, evoking a sense of biological threat. When applied to human interaction, the word shifts to describe a caustic, stinging quality of communication. It implies a level of hatred that is not just angry, but actively intended to wound or destroy the target's reputation, similar to the way a toxin attacks a body.
Used to describe the degree of harmfulness or hostility, such as measuring the virulence of a strain or the virulence of a critique.