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
Synonyms
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
Cold weather and hazardous travel conditions may lead to a smaller turnout for Trump's inauguration weekend.
—
David Faris, Newsweek, 19 Jan. 2025
After the Marshall Fire, hazardous gases associated with the wildfire smoke, such as benzene and naphthalene, could be detected in homes downwind of the fire long after the burns were put out.
—Alejandra Borunda, NPR, 19 Jan. 2025
They are known to hide in footwear, under furniture or even in beds, making nighttime encounters particularly hazardous.
—Scott Travers, Forbes, 18 Jan. 2025
Needles and Razor Blades Do not make waste collection more hazardous.
—Melissa Locker, Southern Living, 18 Jan. 2025
See all Example Sentences for hazardous 
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David Faris, Newsweek, 19 Jan. 2025
After the Marshall Fire, hazardous gases associated with the wildfire smoke, such as benzene and naphthalene, could be detected in homes downwind of the fire long after the burns were put out.
—Alejandra Borunda, NPR, 19 Jan. 2025
They are known to hide in footwear, under furniture or even in beds, making nighttime encounters particularly hazardous.
—Scott Travers, Forbes, 18 Jan. 2025
Needles and Razor Blades Do not make waste collection more hazardous.
—Melissa Locker, Southern Living, 18 Jan. 2025
See all Example Sentences for hazardous
Dictionary Entries Near hazardous
Cite this Entry
“Hazardous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hazardous. Accessed 22 Jan. 2025.
Copy CitationKids Definition
hazardous
adjective
haz·ard·ous
ˈhaz-ərd-əs
hazardously
adverb
hazardousness
noun
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