1.
optimism
The tendency or philosophy of looking at the bright side of things and expecting favorable outcomes. Can refer to a personal attitude or a philosophical position.
楽観主義 refers to the attitude or philosophy of expecting favorable outcomes. Uses the 主義 (-ism) suffix.
Forms
- 楽観主義者: optimist (person)
- 楽観主義的な: optimistic (adjectival)
Similar words
楽観 is the simpler noun/suru verb meaning 'optimism' or 'to be optimistic.' 楽観主義 is more philosophical or ideological, referring to a worldview rather than a momentary feeling.