na-adjective
world-weary; pessimistic; sick of life
Describes a person or attitude that is tired of life, cynical, or pessimistic. Often used in literary or psychological contexts.
彼は厭世的な考え方をするようになった。
He has come to have a pessimistic way of thinking.
その小説の主人公は厭
The protagonist of that novel is a world-weary young man.
厭世 is the noun form meaning 'pessimism' or 'world-weariness'. 厭世的 is the adjectival form.
From 厭世 (world-weariness) + 的 (-like). 厭世 is composed of 厭 (dislike, be tired of) and 世 (world, society).