災難

1. Origins, structure, and basic meaning

• Structure: 災難 (さいなん) is unexpected serious misfortune or disaster. 災難に遭う is an event suffered; 災難にも is a concessive response target.
• Basic usage: A traveler suffers the loss of a wallet; a family responds calmly even to a sudden disaster.

2. Common pitfalls and similar expressions

• Personal mishap suffered and disaster met with composure
  • The first is an idiom for encountering misfortune; inclusive も in the second emphasizes response even under adversity. Scale depends on context.