virulency

And the prophets, in spite of their virulency, produced the highest forms of artistic beauty.

The mortality at times has proved very great in this disease when it has appeared with unusual virulency.

Sometimes, without doubt, the virulency of the disease is lessened.

Thirdly, from the virulency of the liquor it ejects, and the sad effects and symptoms that follow it.

Satirical virulency may vex men sorely, but it hardly ever soundly converts them.