viperine
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/'vaɪpɚrɪn/
🇬🇧
/'vaɪpəraɪn/
Like a viper, especially in being poisonous or harmful.
The snake's behavior was viperine, causing fear among the villagers.
Having a harmful or deceitful nature, like a venomous snake.
His viperine smile masked his true, malicious intentions.