This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Because of the sudden, strange incident, today's stock market is in a grave situation.
All WaniKani users were worried that some unusual incident had befallen Tofugu.
I always get excited during that ominous silence that happens before an unusual incident.