dangerous, risky, precarious
彼は今入院中で、生きられるかどうかは危うい状態だ。
He is currently hospitalized and in critical condition, with his life hanging in the balance.
祖国の運命が危うい
The fate of our homeland is in jeopardy.
— さらば、わが愛／覇王別姫 (1993)
危うい所を助かった。
You saved me from a dangerous situation.