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when you feel sad and upset because of a difficult situation you are depressed.

The opposite of optimistic is pessimistic.

when you don`t know what`s happening or don`t know what to do, you feel c _ _ _ _ _ _ _.

when you are looking forward to something you are e _ _ _ _ _ _.

when you are unhappy because you are alone you are l _ _ _ _ _.

If you are not worried scared or angry you feel c _ _ _.