the GNU version of the Collaborative International Dictionary of English
adj. Somewhat like a viper; viperous.
The Century Dictionary and Cyclopedia
Like a viper; somewhat viperous; malignant; ugly: as, a viperish old woman.
Word Usage
"This morning in the NY Times, Virginia Heffernan found herself missing the viperish presence of Joan Rivers on the red carpet, and quoted some Rivers line about how she's so old and saggy her gynecologist wears a crash helmet."