adjective
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involving great risk
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depending on chance
Other Word Forms
Etymology
Origin of hazardous
Explanation
The noun "hazard" means something dangerous, and the adjective hazardous refers to anything that involves danger. A golf course with lots of sand traps is especially hazardous for golfers. That's why those traps are called hazards. If your car blows a tire in the middle of the night, make sure to turn on your hazard lights. Being invisible to other drivers is hazardous to everyone, especially yourself. Life is, by definition, hazardous. It's full of dangers, both obvious and otherwise. Acknowledge that fact and keep going anyway. If you spend all your time focusing on what's hazardous, you end up missing all the wonderful things in life.
Vocabulary lists containing hazardous
"The Banana Tree," Vocabulary from the short story
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Divergent
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List 7
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Hazardous levels of air pollution are expected across central and southern Los Angeles County, northern Orange County, and Riverside and San Bernardino counties from 5 p.m.
From Los Angeles Times • Jul. 4, 2026
Hazardous waste -- often from Italy's wealthy north -- has long been set alight or buried in the area around Acerra, a city near Naples, in the southern region of Campania.
From Barron's • May 23, 2026
LAS said it sent ambulance crews, paramedics in fast-response cars, advanced paramedics, an incident response officer, and its Hazardous Area Response Team to the scene of the crash.
From BBC • Feb. 18, 2026
Hazardous materials and urban search and rescue teams also responded to the scene, he said.
From Los Angeles Times • Jan. 28, 2026
Hazardous as it had been hitherto for a man of his condition to engage in single combat it was rendered doubly so by this exposure, offered to the public as an aristocratic apologia.
From Scaramouche by Sabatini, Rafael
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
