(Degree of) risk; the likelihood or extent that something is dangerous or may cause harm.
この薬には副作用の危険性があると報告された。
It was reported that this medicine carries a risk of side effects.
夜間に一人で歩く危険性は高いので注意してください。
The risk of walking alone at night is high, so please be careful.
工事現場では安全対策を怠ると事故の危険性が増す。
At construction sites, neglecting safety measures increases the risk of accidents.