psychopath - definition and synonyms

noun [countable] 

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/ˈsaɪkəʊpæθ/
singularpsychopath
pluralpsychopaths
  1. someone who has a serious mental illness that makes them behave in a very violent way towards people

derived word

psychopathic

 

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/ˌsaɪkəʊˈpæθɪk/
adjective