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 influencer — who has over 369,000 followers between her Instagram page and two TikTok accounts — said everyone at the hotel was moved to the second floor, and staff was already taking precaution to prevent potentially hazardous destruction.
—
Zoey Lyttle, PEOPLE, 28 Oct. 2025
Take every precaution to never leave young children and pets alone in vehicles, especially in extreme heat when car interiors can quickly become hazardous.
—Ca Weather Bot, Sacbee.com, 27 Oct. 2025
Thousands of motorists across Texas were warned of potentially hazardous driving conditions as fog settled across the Lone Star state on Monday morning.
—Anna Skinner, MSNBC Newsweek, 27 Oct. 2025
Strong longshore currents can sweep swimmers and surfers into rip currents, piers, jetties and other hazardous areas.
—Nc Weather Bot, Charlotte Observer, 27 Oct. 2025
See All Example Sentences for hazardous
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Zoey Lyttle, PEOPLE, 28 Oct. 2025
Take every precaution to never leave young children and pets alone in vehicles, especially in extreme heat when car interiors can quickly become hazardous.
—Ca Weather Bot, Sacbee.com, 27 Oct. 2025
Thousands of motorists across Texas were warned of potentially hazardous driving conditions as fog settled across the Lone Star state on Monday morning.
—Anna Skinner, MSNBC Newsweek, 27 Oct. 2025
Strong longshore currents can sweep swimmers and surfers into rip currents, piers, jetties and other hazardous areas.
—Nc Weather Bot, Charlotte Observer, 27 Oct. 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 4 Nov. 2025.
Copy CitationKids Definition
hazardous
adjective
haz·ard·ous
ˈhaz-ərd-əs
hazardously
adverb
hazardousness
noun
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