diabolist

/daɪˈæbəlɪst/
noun
  1. A person who believes in or worships the devil; a practitioner of diabolism.
    • The diabolist performed rituals in the abandoned chapel at midnight.
    • The horror movie features a secret society of diabolists plotting to unleash chaos.
    • In the trial, the accused was labeled a diabolist by the church authorities.
  2. A person who is extremely evil or wicked.
    • The novel's antagonist is a cold-hearted diabolist who enjoys causing pain.
    • Some people believe that history's worst tyrants were true diabolists.
    • The dictator was described as a diabolist by those who survived his regime.
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