A more thorough explanation:

Definition: Hazardous means something is risky or dangerous.

Examples:

• Working with chemicals can be hazardous to your health.
• Driving in heavy rain can be hazardous because the roads are slippery and visibility is reduced.
• Walking on a tightrope without a safety net is a hazardous activity.

The examples illustrate the definition of hazardous by showing situations where there is a risk of harm or danger. Working with chemicals can be hazardous because they can be toxic or flammable. Driving in heavy rain can be hazardous because it can lead to accidents. Walking on a tightrope without a safety net is hazardous because there is a risk of falling and getting injured.