What is the person called who always thinks negative? E.g.
- Mr. X always thinks negative.
- Mr. X has negative attitude.
What we can use either? Is there any particular word for this?
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The word is pessimist, a person who expects the worst.
Mr X is a pessimist.
Contrast with optimist.
It is often said that while optimists are happier, pessimists are more often correct.
Optimists are said to live longer than pessimists, though a pessimist might say those extra few years are bound to be miserable.
I've always enjoyed slang expressions like "Mr Unhappy is a real stick in the mud" (i.e. won't participate) and similar expressions like curmudgeon or party pooper. They have slightly different connotations than always thinking negatively, but I think the mindset would have the be similar to support them.