virulence

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun extreme harmfulness (as the capacity of a microorganism to cause disease)
noun extreme hostility

From Middle French virulence, from Late Latin virulentia.

A general sentiment of pity overcame the virulence of religious hatred. — Twice-told tales, Nathaniel Hawthorne
The long pent-up enmity against them burst forth with great virulence. — Some Jewish Witnesses For Christ, Aaron Bernstein
The ill-will of Miss Knag had lost nothing of its virulence in the interval. — Nicholas Nickleby, Charles Dickens

virulency

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