optimism

A tendency to expect the best possible outcome or dwell on the most hopeful aspects of a situation.

The doctrine, asserted by Leibniz, that this world is the best of all possible worlds.

The belief that the universe is improving and that good will ultimately triumph over evil.

In metaphysics: Properly, the metaphysical doctrine of Leibnitz that the existing universe is the best of all possible universes.

The doctrine that the universe advances on the whole, so as to be tending toward a state in the indefinite future different in its general character from that in the indefinite past.

The belief, or disposition to believe, that whatever exists is right and good, in some inscrutable way, in spite of all observations to the contrary.

The opinion or doctrine that everything in nature, being the work of God, is ordered for the best, or that the ordering of things in the universe is such as to produce the highest good.

A habitual tendency or a present disposition to take the most hopeful view of future events, and to expect a favorable outcome even when unfavorable outcomes are possible; — opposed to pessimism.

a tendency to expect the best, or at least, a favourable outcome