mystery; strange event; mysterious affair
Refers to an event or matter that is puzzling, inexplicable, or eerie. Often used in literary or narrative contexts.
Rumor has it that strange events occur night after night in that old mansion.
He is a famous detective who has solved many mysterious cases.
Compound of 怪 (kai, 'mysterious') and 事 (ji, 'matter, event'). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning.