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Definition of hazardousnext

Synonym Chooser

How is the word hazardous distinct from other similar adjectives?

Some common synonyms of hazardous are dangerous, perilous, precarious, and risky. While all these words mean "bringing or involving the chance of loss or injury," hazardous implies great and continuous risk of harm or failure.

claims that smoking is hazardous to your health

When is dangerous a more appropriate choice than hazardous?

In some situations, the words dangerous and hazardous are roughly equivalent. However, dangerous applies to something that may cause harm or loss unless dealt with carefully.

soldiers on a dangerous mission

When could perilous be used to replace hazardous?

Although the words perilous and hazardous have much in common, perilous strongly implies the immediacy of danger.

perilous mountain roads

In what contexts can precarious take the place of hazardous?

While the synonyms precarious and hazardous are close in meaning, precarious suggests both insecurity and uncertainty.

earned a precarious living by gambling

Where would risky be a reasonable alternative to hazardous?

While in some cases nearly identical to hazardous, risky often applies to a known and accepted danger.

shied away from risky investments

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of hazardous Cooking with a gas stove produces more particulate matter than with an electric stove, and the gas stove also emits other hazardous chemicals such as nitrogen dioxide and benzene. Katelyn Richard, The Conversation, 9 Jan. 2026 The Providence Fire Department’s hazardous materials team responded and is handling the situation in coordination with the Rhode Island Department of Environmental Management, with support from the Rhode Island State Police, the spokeswoman, Kristy DosReis, said. Jack Perry, The Providence Journal, 9 Jan. 2026 Check with your local hazardous household waste center for guidelines to dispose of these items properly. Karen Brewer Grossman, Southern Living, 8 Jan. 2026 Heavy snow and strong wind gusts up to 40 mph will create hazardous travel conditions in northern El Paso County, according to the warning. Lauren Penington, Denver Post, 8 Jan. 2026 See All Example Sentences for hazardous
Recent Examples of Synonyms for hazardous
Adjective
  • Pipes and sewers can be very dangerous for pets and wildlife and Roto-Rooter, with specialized equipment and personnel, has become a go-to call to save cats, dogs, turtles and more.
    Alexander Coolidge, Cincinnati Enquirer, 7 Jan. 2026
  • Ole Miss has enough dangerous weapons in quarterback Trinidad Chambliss, running back Kewan Lacy and wide receivers Harrison Wallace III, De’Zhaun Stribling and Deuce Alexander to make a tired defense pay.
    Jordan McPherson, Miami Herald, 7 Jan. 2026
Adjective
  • The clock gives humanity just 89 seconds to reverse course, its most perilous setting ever.
    The Editorial Board, Chicago Tribune, 6 Jan. 2026
  • That on its own is a perilous position.
    Jim Edwards, Fortune, 2 Jan. 2026
Adjective
  • The system focuses on physical interception rather than electronic warfare, addressing scenarios where jamming proves ineffective or risky.
    Aamir Khollam, Interesting Engineering, 10 Jan. 2026
  • Directed by Steven Lisberger, the movie leans hard into CGI at a time when that was still considered risky and experimental.
    Allison DeGrushe, Entertainment Weekly, 9 Jan. 2026
Adjective
  • The lawsuit names specific brands — including cereals, pizzas, sodas, and potato chips — linking them to serious health problems.
    Alan Greenblatt, CBS News, 12 Jan. 2026
  • Kittle was carted off the field, indicating a serious injury, after he was tackled by safety Marcus Epps at the right sideline.
    Chris Biderman, Sacbee.com, 12 Jan. 2026
Adjective
  • Single-Food Diets Diets that rely on a single food or drink, such as the cabbage soup diet, grapefruit diet, or Master Cleanse drink diet, as well as diets that rely on a single food group, like the fruitarian diet, are unsafe and lack key nutrients your body needs to function.
    Jillian Kubala, Health, 6 Jan. 2026
  • Since the video was posted, Hasan, who is Somali, said his center has received harassing phone calls making staff members and parents feel unsafe.
    Charlotte Kramon, Twin Cities, 6 Jan. 2026

Browse Nearby Words

Cite this Entry

“Hazardous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hazardous. Accessed 13 Jan. 2026.

More from Merriam-Webster on hazardous

Last Updated: - Updated example sentences
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