From Longman Dictionary of Contemporary Englishsplit personalityˌsplit personˈality noun [countable] MPa condition in which someone has two very different ways of behaving
Examples from the Corpus
split personality• And he accused her of having a split personality.• As tonight attests, a tape of two halves was the product of a band with a split personality.• Schizophrenia is classified as a functional psychosis and split personality as a dissociative hysterical neurosis, as different as tonsillitis and appendicitis. 