Antonyms of noun optimism

2 senses of optimism

Sense 1
optimism -- (the optimistic feeling that all is going to turn out well)
       Antonym of pessimism (Sense 1)
      => pessimism -- (the feeling that things will turn out badly)

Sense 2
optimism -- (a general disposition to expect the best in all things)
       Antonym of pessimism (Sense 2)
      => pessimism -- (a general disposition to look on the dark side and to expect the worst in all things)

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

2 senses of optimism

Sense 1
optimism -- (the optimistic feeling that all is going to turn out well)
       => hope -- (the general feeling that some desire will be fulfilled; "in spite of his troubles he never gave up hope")

Sense 2
optimism -- (a general disposition to expect the best in all things)
       => disposition, temperament -- (your usual mood; "he has a happy disposition")