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 © …

What is hazardous energy? Energy sources including electrical, mechanical, hydraulic, pneumatic, chemical, thermal, or other sources in machines and equipment can be hazardous to workers. …

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

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.

Hazardous definition: Marked by danger; perilous.

Apr 26, 2026 · Adjective hazardous (comparative more hazardous, superlative most hazardous) Risky; dangerous; with the nature of a hazard. Synonym: high-wire

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

Apr 11, 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 …

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.