[adj] expecting the best in this best of all possible worlds; "in an optimistic mood"; "optimistic plans"; "took an optimistic view" [adj] expecting the best; "an affirmative outlook"
affirmative, bullish, cheerful, pollyannaish, rose-colored, rosy, sanguine, starry-eyed, upbeat
pessimistic
agape, agog, all agog, anticipant, anticipating, anticipative, anticipatory, awaiting, beaming, blithe, blithesome, bright, bright and sunny, buoyant, certain, cheerful, cheery, chiliastic, confident, couleur de rose, eager, elated, eupeptic, euphoric, ex