means A hopeful disposition that expects good outcomes and sees the favorable side of things, even in adversity.

from From Latin 'optimus,' meaning 'best.' The term was coined in the early 18th century by French Jesuits writing in their journal to describe the philosopher Leibniz's doctrine that ours is 'the best of all possible worlds.' Voltaire later skewered that very idea in 'Candide,' so optimism arrived in the world already half-mocked — and somehow kept smiling anyway.