When the war broke out, he discovered, to his horror, that Phyllis actually had political ideas-unshakable, obstinate ideas opposed to his own-and that he had been nourishing in his bosom a Viperous patriot.
"The Red Planet"
William J. Locke
The cutting of great tracts of grass for hay stirred them into Viperous action.
"Land of the Burnt Thigh"
Edith Eudora Kohl
It's more Viperous than any other snake of the viper bunch, an' its disposition is mean and yellow right through.
"Plotting in Pirate Seas"
Francis Rolt-Wheeler