noun which may take the genitive case particle 'no', noun
peerless; matchless; unrivaled
Describes something so outstanding that nothing in its generation or era can compare. Often used with nouns like 美女 (beauty), 名作 (masterpiece), or 天才 (genius).
彼女は絶世の美女として知られている。
She is known as a peerless beauty.
この絵は絶世の名作だ。
This painting is an unrivaled masterpiece.
From 絶 (to surpass, to cut off) and 世 (world, generation), literally 'surpassing the generation'.