viper

US /ˈvaɪ.pɚ/
UK /ˈvaɪ.pɚ/
"viper" picture
1.

a venomous snake with large hinged fangs, typically having a broad head and stout body, and often a patterned skin.

:
The hiker narrowly avoided stepping on a coiled viper.
The zoo has a special enclosure for dangerous vipers.
2.

a malicious or treacherous person.

:
He's a real viper, always spreading rumors and causing trouble.
Beware of that woman; she's a cunning viper.