virulent

She is believed to have contracted the virulent norovirus which is currently rampant in the UK.

Lady Randolph, afraid of what she had done, yet virulent against the Contessa, had suggested that it should be given up.

Her feeling about "imperfect" ladies was of most virulent disapproval.

Another class were virulent controversialists, who preached politics, and too often let Christianity alone.

Much of political quackery was swept away forever, one may hope, by its virulent outbreak.

With what ability he executed his great trust in the face of a powerful and most virulent opposition, the event has fully shown.