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
The National Weather Service (NWS) has warned that travel in these areas may be extremely hazardous, or impossible in parts.
—
Lottie McGrath, Newsweek, 21 Nov. 2024
Much of the state was under a Winter Weather Advisory, with the wet, heavy snow creating hazardous driving conditions.
—Maia Pandey, Journal Sentinel, 21 Nov. 2024
Sources: Energy Policy Institute at the University of Chicago, Dialogue Earth
Restrictions on hazardous pesticides are saving lives
In 2018, pesticides were implicated in a third of suicides in Nepal, where two-thirds of the population works in farming.
—Erika Page, The Christian Science Monitor, 20 Nov. 2024
Lower numbers indicate cleaner air, while a higher score indicates more pollution; an AQI below 50 is considered good, while anything above 300 is classified as hazardous.
—Karina Acharya, Condé Nast Traveler, 20 Nov. 2024
See all Example Sentences for hazardous 
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Lottie McGrath, Newsweek, 21 Nov. 2024
Much of the state was under a Winter Weather Advisory, with the wet, heavy snow creating hazardous driving conditions.
—Maia Pandey, Journal Sentinel, 21 Nov. 2024
Sources: Energy Policy Institute at the University of Chicago, Dialogue Earth
Restrictions on hazardous pesticides are saving lives
In 2018, pesticides were implicated in a third of suicides in Nepal, where two-thirds of the population works in farming.
—Erika Page, The Christian Science Monitor, 20 Nov. 2024
Lower numbers indicate cleaner air, while a higher score indicates more pollution; an AQI below 50 is considered good, while anything above 300 is classified as hazardous.
—Karina Acharya, Condé Nast Traveler, 20 Nov. 2024
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 30 Nov. 2024.
Copy CitationKids Definition
hazardous
adjective
haz·ard·ous
ˈhaz-ərd-əs
hazardously
adverb
hazardousness
noun
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