Dictionary
viperous
adjective vi·per·ous \-p(ə-)rəs\
Definition of VIPEROUS
1
: viperine
2
: having the qualities attributed to a viper : malignant, venomous <the backstabbing of a viperous family>
— vi·per·ous·ly adverb
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First Known Use of VIPEROUS
1535
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