noun
A person who predicts or warns of disaster or misfortune
preposition
A word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause
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The economist was often dismissed as a prophet of doom for his pessimistic forecasts.
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Don't listen to him, he's just a prophet of doom always predicting the worst.
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That guy is such a buzzkill, always acting like a prophet of doom.
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Her constant negativity earned her the reputation of being a prophet of doom among her friends.