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"Optimistic" means having a positive outlook or expecting good things to happen in the future.
The antonym of "optimistic" is "pessimistic," which refers to having a negative outlook or expecting bad things to happen.
"Hopeful", "positive", and "confident" all align with a positive outlook, similar to "optimistic," but they are not true antonyms.
So, the correct answer is "Pessimistic."
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