noun
a supernatural being, typically a corpse, that is reanimated and possesses unnatural powers
adjective
pertaining to such beings or characteristics
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Legends speak of creatures known as the undead, beings who have risen from the dead.
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I heard that movie has a bunch of undead characters in it.
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The video game is full of creepy undead monsters.
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The project seemed like an undead idea, constantly coming back to haunt us.