I like the definition of optimism I'm getting from "Learned Optimism" that optimism isn't believing that nothing bad will happen but that when it does one will not be powerless but able to cope. That fits the way I think. Believing bad stuff won't happen just feels stupid. Bad stuff and good stuff both happen every day. Believing I can cope and learn and hopefully use all experiences however difficult for good does feel reassuring, like something real to hold onto. I had never thought of that "can cope" attitude as being a definition of optimism.