Literary or formal noun meaning rarity or something uncommon. Not used in everyday conversation; more often seen in written or elevated contexts.
Such talent is rare.
希世の書物が発見された。
A rare book was discovered.
Kanji spelling using 希 (rare/hope). Rarely used; the word itself is uncommon.
Kanji spelling using 稀 (rare/unusual). Rarely used; the word itself is uncommon.
Compound of 希/稀 (rare) and 世 (world/generation), literally 'rare in the world'. The exact historical derivation is uncertain.