What is the term for something that is dangerous?

The term that accurately refers to something that is dangerous is "hazardous." This term specifically denotes conditions or materials that present a risk of harm or danger, whether to individuals, property, or the environment. It is often used in contexts such as health and safety regulations, where hazardous materials or situations are those that can cause injury or damage.

While "perilous," "risky," and "unsafe" all suggest danger in some form, they do so in slightly different contexts. "Perilous" usually implies a greater degree of risk or danger, often in a dramatic or life-threatening sense. "Risky" refers to situations where there is a chance of loss or danger but does not inherently mean the situation is dangerous; rather, it focuses on the potential for unwanted outcomes. "Unsafe" generally indicates a lack of safety but may not explicitly convey the presence of danger, often merely suggesting that certain conditions do not meet safety standards.

Therefore, "hazardous" is the most precise term that captures the essence of danger itself.