不思議

1. Origins, structure, and basic meaning

• Structure: 不思議 is read ふしぎ.
• Basic usage: It describes something mysterious or strange that is difficult to explain.

2. Common pitfalls and similar expressions

• Finding a phenomenon strange
  • 不思議です: the color change in water is regarded as strange.
• A mysterious sound
  • 不思議な音: a difficult-to-explain sound heard from an empty room.