1. Expecting the best in this best of all possible worlds
   "in an optimistic mood"; "optimistic plans"; "took an optimistic view" 
2. Expecting the best
   - affirmative

See also: bullish, cheerful, hopeful, optimism, optimistically, pollyannaish, positive, rose-colored [US], rose-coloured [Brit, Cdn], rosy, sanguine, starry-eyed, upbeat

Antonym: pessimistic

Encyclopedia: Optimistic

• perturbation
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