Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Deadly

Deadly as nightshade.
—Thomas Bailey Aldrich

Deadly as the viper of Sumatra.
—Edward Bulwer-Lytton

Deadly as the sting of satire.
—James Cawthorn

Deadly as the canker-worm.
—James Anthony Froude

Deadly as a night frost.
—Maurice Hewlett

The venom clamours of a jealous woman poison more deadly than a dog’s tooth.
—William Shakespeare