Usage patterns
〈事〉について悲観的だto be pessimistic about something
He is pessimistic about the future.
悲観的になるto become pessimistic
After a string of failures, he became pessimistic.
悲観的な見方a pessimistic view/outlook
Many people take a pessimistic view of the economy.
悲観的に考えるto think pessimistically
It's not good to think pessimistically about everything.