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I'm very pessimistic.

I'm not as pessimistic as what a number of people seem to believe.

Pessimism, when you get used to it, is just as agreeable as optimism.

I'm not a pessimist at all, but I'm not an optimist, either.

I am not a pessimist, but I am not an optimist about the future of American democracy.

When thinking about the future, it is fashionable to be pessimistic. Yet the evidence unequivocally belies such pessimism. Over the past centuries, humanity's lot has improved dramatically - in the developed world, where it is rather obvious, but also in the developing world, where life expectancy has more than doubled in the past 100 years.

I'm a pessimist. But I'm a pessimist with a sense of responsibility.

There's nothing particularly wrong with being more pessimistic than optimistic. Optimism is broad-based, non-detail-oriented thinking; pessimism is detail-oriented thinking.