strange incident; unusual occurrence; rare event
Refers to an event that is out of the ordinary, surprising, or hard to believe. Often used in news or storytelling.
A strange incident occurred in the neighborhood last night.
grave incident; serious accident; unexpected tragedy
Emphasizes the seriousness and unexpectedness of the event. Often written as 椿事 in this sense, though 珍事 is also used.
The grave incident shocked the whole nation.
彼が遅刻するなんて珍事だ。
It's a rare event for him to be late.
rare event; unusual incident
Standard kanji spelling for a strange or unusual incident.
Rare spelling used especially for a grave or serious unexpected incident.
Compound of 珍 (rare, curious) and 事 (matter, event). The alternative spelling 椿事 uses 椿 (camellia), which is likely ateji based on the reading ちん, though the exact origin is uncertain.