Antonyms of adj optimistic

2 senses of optimistic

Sense 1
optimistic (vs. pessimistic) -- (expecting the best in this best of all possible worlds; "in an optimistic mood"; "optimistic plans"; "took an optimistic view")

pessimistic (vs. optimistic) -- (expecting the worst possible outcome)
        => bearish -- (expecting prices to fall)
        => demoralized, demoralised, discouraged, disheartened -- (made less hopeful or enthusiastic; "desperate demoralized people looking for work"; "felt discouraged by the magnitude of the problem"; "the disheartened instructor tried vainly to arouse their interest")

Sense 2
affirmative, optimistic -- (expecting the best; "an affirmative outlook")

INDIRECT (VIA neutral, positive) -> negative -- (characterized by or displaying negation or denial or opposition or resistance; having no positive features; "a negative outlook on life"; "a colorless negative personality"; "a negative evaluation"; "a negative reaction to an advertising campaign")
INDIRECT (VIA positive, negative) -> neutral -- (possessing no distinctive quality or characteristics)

Similarity of adj optimistic

2 senses of optimistic

Sense 1
optimistic (vs. pessimistic) -- (expecting the best in this best of all possible worlds; "in an optimistic mood"; "optimistic plans"; "took an optimistic view")
       => bullish -- (expecting a rise in prices)
       => cheerful, pollyannaish, upbeat -- (pleasantly (even unrealistically) optimistic)
       => rose-colored, rosy -- (reflecting optimism; "a rosy future"; "looked at the world through rose-colored glasses")
       => starry-eyed -- (unrealistically or naively optimistic; "a starry-eyed reformer"; "starry-eyed idealism")
       => sanguine -- (confidently optimistic and cheerful)
          Also See-> hopeful#1; positive#1

Sense 2
affirmative, optimistic -- (expecting the best; "an affirmative outlook")
       => positive (vs. negative) (vs. neutral) -- (characterized by or displaying affirmation or acceptance or certainty etc.; "a positive attitude"; "the reviews were all positive"; "a positive benefit"; "a positive demand")