Jekyll and Hyde

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Related to Jekyll and Hyde personality: Jekyll and Hyde Syndrome

Jekyll and Hyde

a. a person with two distinct personalities, one good, the other evil
b. (as modifier): a Jekyll-and-Hyde personality
References in periodicals archive ?
But Graham, who lives in Walsall, said Alex had a Jekyll and Hyde personality which showed itself through wild mood swings.
"A 'Jekyll and Hyde personality,' he was a married, religious man with the 'dark shadow' of heavy drug use," he said.