Danger (noun)

1. The possibility that something bad or unpleasant will happen.
2. A situation or thing that is likely to cause harm or injury.
3. A person or thing that is likely to cause harm or injury.

Origin:

Middle english: from old french, from late latin periculum, from latin periculosus dangerous, from periculum peril.

Examples:

1. The children were warned of the dangers of playing with matches.
2. The strong current in the river is a danger to swimmers.
3. The company is aware of the dangers of asbestos.
4. She was aware of the danger of driving in the storm.
5. The danger of falling rocks on the mountain trail.