危険

1. Origins, structure, and basic meaning

• Structure: 危険 is read as きけん and is a noun and na-adjective for danger, risk, or a condition in which harm may occur.
• Basic usage: A warning sign appears in 危険と書かれた札, while judging a condition appears in 危険だ.

2. Common pitfalls and similar expressions

• Noun and condition description
  • It can name danger itself or describe an action, place, or situation as dangerous.
• Difference from 危ない
  • The meanings are close, but 危ない is common in immediate spoken warnings, while 危険 fits signs, explanations, and assessments.