希有

1. Origins, structure, and basic meaning

• Structure: 希有 is read as けう and is a na-adjective describing something as extremely rare or exceptional.
• Basic usage: An exceptional person appears in 希有な演奏家, while a rare document appears in 資料は希有である.

2. Common pitfalls and similar expressions

• A high degree of rarity
  • It is a formal evaluation suggesting something is exceptionally difficult to encounter, not merely uncommon.
• Difference from 珍しい
  • Compared with the everyday word for unusual or rare, this term has a more literary sense of exceptional rarity.