Sentence examples for are pessimistic from inspiring English sources

The part of a sentence 'are pessimistic' is both correct and commonly used in written English.
You can use it to describe a group of people or a collective attitude/feeling towards a situation. For example: Many people in our society are pessimistic about the state of the economy. The researchers found that the majority of participants were pessimistic about the future of the planet. It is clear that the team's recent losses have left the players feeling increasingly pessimistic about their chances in the upcoming tournament.