It would be unfortunate to end up alone in an elevator with a psychopath. A psychopath is a mentally ill person with violent tendencies.

Psychopath is a psychiatric term that refers to a person suffering from a mental illness involving violent behavior or various kinds of abnormal social interactions. A person who's been diagnosed as a psychopath has a lot of trouble interacting with other people and living a normal life. The noun psychopath is also used casually to mean simply a bizarre or unpredictably violent person. The word comes from the Greek words for "mind" and "suffering": psykhe and pathos.

Definitions of psychopath
  1. noun
    someone with a sociopathic personality; a person with an antisocial personality disorder (`psychopath' was once widely used but has now been superseded by `sociopath')
    synonyms: sociopath
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    type of:
    mental case, neurotic, psychoneurotic
    a person suffering from neurosis
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