1. the quality or state of being dangerous or risky

Examples

• The perilousness of the mountain climb became apparent when the weather turned bad.
• She was aware of the perilousness of her financial situation.
• The captain warned his crew about the perilousness of sailing through the storm.
• The perilousness of the mission required careful planning.
• Despite the perilousness of the journey, they decided to continue.
• The documentary highlighted the perilousness of deep-sea diving.