MEANING:

be extremely cruel and merciless; be cruel to sb; cruel and evil;

Heartless and cruel, with poisonous methods. This idiom describes a person's character traits, meaning that the person is cruel-hearted and vicious, does things without regard to the feelings and interests of others, and will even resort to harsh means to achieve his or her own ends. This idiom is usually used to describe those who are extremely cold and unscrupulous, containing a pejorative meaning.

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