optimism
//ˈɒp.tɪ.mɪ.zəm//
Noun
optimismSingular
1
A feeling or belief that good things will happen in the future; a tendency to expect the best possible outcome.
Despite the challenges, she faced the future with optimism.
2
The philosophical doctrine that this world is the best of all possible worlds, or that good will ultimately prevail over evil.
Leibniz's optimism holds that we live in the best of all possible worlds.