Definition of "viperishly" []

• In a viperish manner. (adverb)

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• "A shocked veteran, till then invisible in a neighbouring armchair, poked out a lean head like a tortoise and said “Sh!” viperishly."
• "He was frowning upon me, and smiling viperishly at the same time."
• ""I know what you mean," she flung at him, viperishly."