hazardous
adjective
haz·ard·ous
ˈha-zər-dəs 
1
: involving or exposing one to risk (as of loss or harm)
a hazardous occupation
disposing of hazardous waste
2
: depending on the effect of unpredictable and unanalyzable forces in determining events : depending on hazard (see hazard entry 1 sense 2a) or chance
hazardous outcomes
hazardously
adverb
hazardousness
noun
Examples of hazardous in a Sentence
It was a hazardous voyage.
These are hazardous chemicals that can cause death if inhaled.
Recent Examples on the Web
The hazardous conditions could impact the Friday evening commute.
—
Ca Weather Bot, Sacbee.com, 30 Dec. 2025
Sunday’s hazardous weather outlook that brought snow may have passed, but the bone-chilling wind will still be in play Monday morning before temperatures rise this week.
—Noelle Alviz-Gransee, Kansas City Star, 29 Dec. 2025
Heavy snow, extreme cold and damaging winds are likely to create hazardous conditions stretching from Montana east to Maine, and Texas north to Pennsylvania, according to the National Weather Service (NWS).
—Kristin Wright, NPR, 29 Dec. 2025
Areas of patchy fog are also possible across inland areas and could create a hazardous drive on places like Alligator Alley.
—Austin Carter, CBS News, 29 Dec. 2025
See All Example Sentences for hazardous
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Ca Weather Bot, Sacbee.com, 30 Dec. 2025
Sunday’s hazardous weather outlook that brought snow may have passed, but the bone-chilling wind will still be in play Monday morning before temperatures rise this week.
—Noelle Alviz-Gransee, Kansas City Star, 29 Dec. 2025
Heavy snow, extreme cold and damaging winds are likely to create hazardous conditions stretching from Montana east to Maine, and Texas north to Pennsylvania, according to the National Weather Service (NWS).
—Kristin Wright, NPR, 29 Dec. 2025
Areas of patchy fog are also possible across inland areas and could create a hazardous drive on places like Alligator Alley.
—Austin Carter, CBS News, 29 Dec. 2025
See All Example Sentences for hazardous
Cite this Entry
“Hazardous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hazardous. Accessed 1 Jan. 2026.
Copy CitationKids Definition
hazardous
adjective
haz·ard·ous
ˈhaz-ərd-əs
hazardously
adverb
hazardousness
noun
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