noun
a person's character or behavior that is divided into two distinct personas
adjective
describing something that has two distinct aspects or characteristics
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The patient exhibited symptoms of a double personality, indicating a potential dissociative identity disorder.
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My friend always jokes about having a double personality, saying she's a different person at work than she is at home.
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I think my brother has a double personality because he acts so differently around his friends than he does with our family.
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The author's writing style can be described as having a double personality, switching between serious and humorous tones.