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.
More than 40% of roadless areas have high or very high wildfire hazard potential, but only 5% have received hazardous fuels reduction treatments since 2014, he said.
From Los Angeles Times ● Aug. 18, 2026
Italy's civil protection agency warns that a combination of volcanic activity and sudden weather changes higher up the mountain can make conditions hazardous.
From BBC ● Aug. 17, 2026
Alongside greenhouse gases, gas plants emit fine particulate matter, linked to a range of heart and lung problems; nitrogen oxides, which aggravate respiratory disease; and hazardous air pollutants including mercury, formaldehyde and benzene.
From Barron's ● Aug. 11, 2026
The EPA has warned that hackers who penetrate a water system could also alter treatment chemicals to hazardous levels.
From The Wall Street Journal ● Aug. 8, 2026
If a mission seemed especially hazardous, or if it involved a place they knew to be bad, they carried everything they could.
From "The Things They Carried" by Tim O'Brien
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.
