"Doom merchant" is a term often used to describe someone who constantly predicts and speaks of negativity and misfortune. This individual is often viewed as a pessimist and can have a negative impact on those around them. Synonyms for the term "doom merchant" include "Gloom and Doom Prophet," "Negative Nancy," "The Prophet of Calamity," "Pessimist," and "Disaster Diviner." Other terms used to describe individuals with similar attitudes include "Eeyore," "Debbie Downer," and "Chicken Little." While these individuals may have valid concerns, their constant focus on the negative can be exhausting and detrimental to one's mental health and well-being.