Hazardous (adjective)

1. Involving or causing danger or risk.
2. Involving potential harm or danger.
3. Likely to cause injury or harm.
4. Full of hazards.
5. Pose a risk.

Origin:

From hazard, noun.

Examples:

1. The job was hazardous.
2. The area was hazardous to health.
3. The material was hazardous to handle.
4. The conditions were hazardous to navigation.
5. The chemicals were hazardous to the environment.