dangerous, hazardous, precarious, perilous, risky mean bringing or involving the chance of loss or injury. dangerous applies to something that may cause harm or loss unless dealt with carefully.

HAZARDOUS definition: full of risk; perilous; risky. See examples of hazardous used in a sentence.

Add to word list dangerous and involving risk, especially to someone's health: hazardous industries / materials / substances (Definition of hazardous from the Cambridge Business English Dictionary © …

Definition of hazardous adjective from the Oxford Advanced Learner's Dictionary. involving risk or danger, especially to somebody’s health or safety. They endured a hazardous journey through …

Something that is hazardous is dangerous, especially to people's health or safety. They have no way to dispose of the hazardous waste they produce. Passive smoking can be hazardous to health.

Hazardous refers to anything that presents a potential source of danger, harm, or risk to the health, safety, or environment. This could involve objects, substances, activities, or situations that could …

1. to risk; to be prepared to do (something, the result of which is uncertain).

Hazardous definition: Marked by danger; perilous.

hazardous - WordReference English dictionary, questions, discussion and forums. All Free.

Jan 4, 2026 · The term “hazardous” is often used to describe substances or situations that pose a threat to health, safety, or the environment. However, understanding what constitutes hazardous requires a …