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
His optimism never loses hope even in the most difficult situations.
Optimism and pessimism are two opposing worldviews in the history of philosophy.
The direct antonym, meaning pessimism as a doctrine.
Compound of 楽天 (optimistic, from 楽 'enjoy' and 天 'heaven') and 論 (theory, discourse). The exact historical derivation is uncertain, but it follows the pattern of philosophical terms ending in 論.