a.

1. (Metaph.) Of or pertaining to optimism; tending, or conforming, to the opinion that all events are ordered for the best.

2. Hopeful; sanguine; as, an optimistic view.

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adj

Definition: believing positively
Antonyms: dejected, depressed, doubtful, gloomy, hopeless, pessimistic, sorrowful

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IN BRIEF: Expecting the best.

I always like to look on the optimistic side of life, but I am realistic enough to know that life is a complex matter. — Walt Disney (1901-1966)