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treacherous
01
коварный
inclined to deceive or betray others for personal gain or advantage
02
вероломный
dangerous for not being stable or reliable
Пример
The treacherous colleague sabotaged his coworkers' projects to climb the corporate ladder.
She was known for her treacherous nature, always looking out for her own interests at the expense of others.
They were shocked to discover the treacherous motives behind his seemingly kind gestures.
His treacherous actions left a trail of broken trust and damaged relationships.
He proved to be treacherous when he leaked sensitive information to their competitors.