viper
//ˈvaɪ.pər//
Noun
viperSingular
vipersPlural
1
A venomous snake with large hinged fangs, typically having a broad triangular head and a stout body.
The hiker spotted a viper coiled on the rocky path and carefully backed away.
2
A spiteful, treacherous, or malicious person.
Be careful around him; he's a viper who will betray you without hesitation.