noun
a person who tends to be hopeful and confident about the future or the success of something
adjective
showing a tendency to be hopeful and confident
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The optimist believes that every obstacle can be overcome with the right attitude.
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My friend is such an optimist, always seeing the bright side of things.
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Don't worry, I'm an optimist - everything will work out in the end.
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Being an optimist is like seeing the glass half full even when it's almost empty.