Antonyms of adj pollyannaish

1 sense of pollyannaish

Sense 1
cheerful, pollyannaish, upbeat -- (pleasantly (even unrealistically) optimistic)

INDIRECT (VIA optimistic) -> pessimistic -- (expecting the worst possible outcome)

Similarity of adj pollyannaish

1 sense of pollyannaish

Sense 1
cheerful, pollyannaish, upbeat -- (pleasantly (even unrealistically) optimistic)
       => optimistic (vs. pessimistic) -- (expecting the best in this best of all possible worlds; "in an optimistic mood"; "optimistic plans"; "took an optimistic view")