Defeatist (noun)

1. A person who has a pessimistic attitude and believes that a situation or task cannot be changed or improved.
2. A person who believes that a situation is hopeless and that defeat is inevitable.

Origin:

From defeat + -ist.

Examples:

1. He was called a defeatist for his negative attitude and lack of confidence in the team's ability to win.
2. The defeatist attitude of the employees was a major obstacle to the company's success.
3. The general was criticized for his defeatist attitude and lack of confidence in the troops.
4. The defeatist attitude of the politicians made it difficult to pass meaningful legislation.
5. He had a defeatist attitude and did not believe that the company could turn around.