IPA: /ˈpɛsɪmɪst/
KK: /ˈpɛsɪmɪst/
A person who tends to see the negative side of things and expects bad outcomes.
Despite the good news, she remained a pessimist about the future.
Pessimist → It is formed from "pessimus" (meaning worst) and the suffix "-ist" (meaning one who practices or is concerned with). A pessimist is one who tends to see the worst aspect of things or believes that the worst will happen.
Think of someone who focuses on the 'worst' ('pessimus') outcomes — that's why a pessimist is someone who expects negative results.