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 Most recently, residents in southern Mesa County, Colorado, have been alerted to hazardous air conditions due to heavy wildfire smoke. Anna Skinner, MSNBC Newsweek, 28 July 2025 Specialized teams from Broward County HazMat arrived to monitor air quality and test for hazardous substances. Milena Malaver, Miami Herald, 25 July 2025 However, sudden shifts in weather, especially gusty winds, can create hazardous boating conditions. Tina Chen, Mercury News, 25 July 2025 Workers refused to work with a hazardous chemical earlier this year, and officials did not issue a citation after a worker was sprayed with another chemical months prior. Connor Giffin, The Courier-Journal, 25 July 2025 See All Example Sentences for hazardous
Recent Examples of Synonyms for hazardous
Adjective
  • More dangerous heat waves The Great Lakes region warmed substantially faster in the six years since the last assessment than it did in decades prior, the report shows.
    Caitlin Looby, jsonline.com, 24 July 2025
  • Here's what each means, according to the NWS: Heat advisory: A heat advisory is the lowest level and is issued for dangerous heat conditions that are not expected to reach the criteria for a more serious alert.
    Chad Murphy, The Enquirer, 24 July 2025
Adjective
  • 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, 28 July 2025
  • In a perilous moment, the titular character uses the bullwhip to attach to a German cargo truck’s rear and drag behind it, saving himself from getting crushed beneath it.
    India Brown, Robb Report, 22 July 2025
Adjective
  • But through the sheer power of mixing genes into new combinations, the risky gamble of interspecies pairings has also sometimes majorly paid off.
    Katherine J. Wu, The Atlantic, 31 July 2025
  • The National Heart, Lung, and Blood Institute (NHLBI) highlights how sleep deficiency, on the other hand, impairs these abilities and is linked to emotional issues, depression, and risky behaviors—especially in children and teens.
    Lucy Notarantonio, MSNBC Newsweek, 31 July 2025
Adjective
  • This surge in extreme heat drives up energy demand and poses serious health risks to vulnerable populations.
    Caitlin Looby, jsonline.com, 24 July 2025
  • Her passenger, also a Lakota West Student, sustained serious injuries.
    Gillian Stawiszynski, Cincinnati Enquirer, 23 July 2025
Adjective
  • In July, the city construction board declared the house an unsafe structure and gave the owners five days to fix the situation.
    Andres Viglucci, Miami Herald, 25 July 2025
  • Playing in unsafe heat can cause immense stress to the body.
    Kalen Lumpkins, Chicago Tribune, 25 July 2025

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Cite this Entry

“Hazardous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hazardous. Accessed 6 Aug. 2025.

More from Merriam-Webster on hazardous

Last Updated: - Updated example sentences
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