doomsayer
/ˈduːmˌseɪər/
noun
- A person who predicts disaster, misfortune, or a very bad outcome, especially one who does so habitually.
- The doomsayer warned that the company would go bankrupt within a year.
- Ignore the doomsayers who say you can't succeed in this field.
- Every economic downturn brings out the doomsayers predicting the end of prosperity.
Antonyms