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 Following the quake, a tsunami advisory was issued, with the potential for hazardous tsunami waves possible for coasts within 300 kilometers of the earthquake epicenter. Abc News, ABC News, 24 June 2026 At the scene, CMPD brought in three armored vehicles and a mobile tactical shield designed to transport officers into potentially hazardous situations. Zaire Breedlove, Charlotte Observer, 24 June 2026 High-voltage lithium-ion battery systems that power electric vehicles are especially prone to thermal runaway if damaged, which can produce intense heat, toxic gases and prolonged fire conditions requiring specialized firefighting and hazardous materials personnel to control the incident. Reeti Malhotra, Sacbee.com, 24 June 2026 Sports Minister Marie Barsacq urged caution, warning against swimming in unauthorized or hazardous areas despite the temptation to cool off. Rena Rowe, The Washington Examiner, 23 June 2026 See All Example Sentences for hazardous
Recent Examples of Synonyms for hazardous
Adjective
  • Others develop dangerous fluctuations in blood pressure and abnormal heart rhythms because the autonomic nervous system becomes affected.
    Faye Chiu, CNN Money, 23 June 2026
  • Sometimes, the streets appear glittering; other times, seedy and dangerous.
    Los Angeles Times, Los Angeles Times, 22 June 2026
Adjective
  • Thrown into the perilous odyssey of the quest for Europe, Gift recounts the memories that led to her departure.
    Melanie Goodfellow, Deadline, 29 June 2026
  • Understanding the gravity of a red flag warning and adhering to these precautions is pivotal in mitigating the risk of wildfires during these perilous conditions.
    CA Weather Bot, Sacbee.com, 25 June 2026
Adjective
  • Achraf Hakimi looked to have another opportunity to take an open shot on goal in the 54th minute, until Dutch defender Micky van de Ven chased him down and made a risky tackle in the goal box.
    Andrew Greif, NBC news, 30 June 2026
  • The groups that brought the lawsuit said the rule would require students to forgo their studies or take out riskier private loans.
    Collin Binkley, Los Angeles Times, 30 June 2026
Adjective
  • Beijing has and been accused of serious human violations, including large-scale arbitrary detention of Uyghur and other Muslim minorities, in Xinjiang.
    Simone McCarthy, CNN Money, 1 July 2026
  • Prosecutors said Anthony Edmond and Rafael Enriquez face the most serious charges, including conspiracy involving firearms trafficking, machineguns and drug trafficking.
    Michael Sinkewicz, FOXNews.com, 1 July 2026
Adjective
  • Green means habitable, yellow means moderately damaged, and red signifies that the building is unsafe.
    Max Saltman, CNN Money, 30 June 2026
  • Prosecutors allege prolonged neglect According to charging documents cited by WNEM-TV5, prosecutors allege Casper was immobile, was not provided proper medical care or adequate nutrition, and was forced to live in unsafe conditions before his death.
    Anthony Thompson, USA Today, 27 June 2026

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Cite this Entry

“Hazardous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hazardous. Accessed 4 Jul. 2026.

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