The adjective 危険 (meaning "dangerous", JLPT N3) conjugates in the Past Negative Polite form as 危険じゃなかったです (kiken janakatta desu). Adjective type: na-adjective.
Context Example
この川は危険じゃなかったです。
Kono kawa wa kiken janakatta desu.
This river was not dangerous.
What is the Past Negative Polite conjugation of 危険 (kiken)?
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