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 Popular among travelers for keeping a phone battery or other electronics fully charged, battery packs have grown in popularity, however some of the devices have been recalled or led to hazardous outcomes. Michael Cappetta, Travel + Leisure, 29 May 2025 Past Incidents in the last 12 hours: Drivers cautioned as heavy rain triggers traffic concerns on westbound I-35 in Merriam A traffic advisory has been issued for hazardous driving conditions attributed to heavy rain on I-35 from 67th Street/Exit 228 to 75th Street/Exit 227. Kansas City Star, 29 May 2025 Longshore currents can sweep swimmers and surfers into rip currents, piers, jetties, and other hazardous areas. Nc Weather Bot, Charlotte Observer, 27 May 2025 Brownfields are abandoned or underused properties, often industrial or commercial, where redevelopment is complicated because of hazardous substances, pollutants or contaminants in the soil. Stephen Underwood, Hartford Courant, 24 May 2025 See All Example Sentences for hazardous
Recent Examples of Synonyms for hazardous
Adjective
  • At times, the Algerian even operated as a wide forward as O’Neil grappled with a forward injury crisis and identified Ait-Nouri as his most dangerous attacking threat.
    Steve Madeley, New York Times, 6 June 2025
  • Of all the things at risk, the loss of an objective reality is perhaps the most dangerous.
    Sammy Roth, Los Angeles Times, 5 June 2025
Adjective
  • The first season traces Ellie and Joel’s perilous journey, punctuated by attacks by the infected, the depredations of groups of raiders, and betrayals galore by would-be allies.
    Michael M. Rosen, The Washington Examiner, 30 May 2025
  • One brother, guided by moral duty, convinces the other to help the mother and join a perilous investigation to find the child.
    Naman Ramachandran, Variety, 26 May 2025
Adjective
  • Not mentioned in the CIT decision—and likely riskier—is section 338 of the Tariff Act of 1930.
    Jill Goldenziel, Forbes.com, 1 June 2025
  • Orbiting and landing on such a small body is complicated, which is part of what makes the mission both interesting and risky, Michel said.
    Ashley Strickland, CNN Money, 28 May 2025
Adjective
  • Nobody else can do what Isak does, but Newcastle lack serious backup at centre-forward.
    Chris Waugh, New York Times, 6 June 2025
  • There were no serious injuries reported or arrests made among the crowd of about 500 teenagers.
    David Matthews, New York Daily News, 6 June 2025
Adjective
  • And in low- and mid-income countries, US$110 billion is lost every year in productivity and medical expenses resulting from unsafe food, per World Health Organization (WHO) data.
    Danielle Nierenberg, Forbes.com, 6 June 2025
  • The driver accelerated away, making unsafe lane changes and weaving in and out of traffic, the trooper's report said.
    Madison Lambert, NBC news, 6 June 2025

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Cite this Entry

“Hazardous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hazardous. Accessed 10 Jun. 2025.

More from Merriam-Webster on hazardous

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