Learn English – How to describe the ‘darker side’ of someone? Context given here

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Context: Foster child learns to manipulate people to make them love her. She meets a kind mother for once, and she doesn't need to revert to her 'psychopathic' (for lack of a better word) side. I am thinking 'alter ego'.

Best Answer

You may use pathological:

  • extreme in a way that is not normal or that shows a mental problem or an illness. (M-W)

or also refer to dark side of her personality.

  • We view the dark side as those characteristics that exist between the normal-range dimensions above and the highly problematic or dysfunctional personality disorders—that is, the dark side is more extreme than the aforementioned traits, but less intense than recognized personality disorders.

(www.psychologytoday.com)

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