楽らく天てん論ろん

noun

optimism (as a doctrine or theory)

Refers to the philosophical stance or theory that the world is fundamentally good or that things will turn out well. Often used in contrast to 厭世論 (pessimism).

See also: 楽天主義

• 彼かれの楽らく天てん論ろんは、どんな困こん難なんな状じょう況きょうでも希き望ぼうを失うしなわない。

  His optimism never loses hope even in the most difficult situations.

• 楽らく天てん論ろんと厭えん世せい論ろんは、哲てつ学がくの歴れき史しで対たい立りつする二ふたつの世せ界かい観かんだ。

  Optimism and pessimism are two opposing worldviews in the history of philosophy.