Demonic is a word to describe behavior or people who are extremely evil or cruel.

It helps to understand this word if you know a demon is a creature of hell. Demonic has that same kind of hellish, diabolical, fiendish, infernal, satanic, unholy quality. This word should not be used lightly. Stealing a candy bar, though wrong, is not demonic. Truly evil behavior, like being a serial killer, is more likely to be described as demonic. In superhero movies, the supervillains are likely to be demonic, since they are more evil than common storybook villains.

Definitions of demonic
  1. adjective
    extremely evil or cruel; expressive of cruelty or befitting hell
    “something demonic in him--something that could be cruel”
    synonyms: diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy
    morally bad or wrong
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