Spiteful or malicious; venomous: a viperish retort. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "viperish" in a sentence
"Enid Graham and Kelli O'Hara have some fun with the viperish sisters."
"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."
"His Slade is a volatile, fascinating mix of old-fashioned courtliness and viperish hostility."