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Optimistic

/ˌɒptəmɪstɪk/

Having a hopeful and positive outlook about the future or success of something.

Synonyms:

She remained optimistic about the future of the planet.

An optimistic outlook can boost your overall health.

Despite the odds, his mood stayed light and optimistic.

Derived from the Latin word optimus, meaning best, with the suffix -istic added in the 18th century to form the English word.

13 mentions per 1 million words

Moderate

Hint: Frequency according to COCA