Antonyms of noun pessimist

1 sense of pessimist

Sense 1
pessimist -- (a person who expects the worst)
       Antonym of optimist (Sense 1)
      => optimist -- (a person disposed to take a favorable view of things)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun pessimist

1 sense of pessimist

Sense 1
pessimist -- (a person who expects the worst)
       => skeptic, sceptic, doubter -- (someone who habitually doubts accepted beliefs)