demon

US /ˈdiː.mən/
UK /ˈdiː.mən/
"demon" picture
1.

an evil spirit or devil, especially one thought to possess a person or act as a tormentor in hell

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Ancient legends speak of powerful demons lurking in the shadows.
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He believed he was possessed by a demon.
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devilfiendevil spiritghoulgoblin
2.

a cruel, evil, or wicked person

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He was a demon of a man, ruthless and unforgiving.
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The dictator was a true demon, responsible for countless atrocities.
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brutemonstertyrantvillainsadist
3.

a person or thing that has a powerful negative effect

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The drug addiction became his personal demon.
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Dealing with bureaucracy can be a real demon.
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cursebanescourgeafflictiontorment