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
What To Know There are currently no major wildfires reported in the areas, but officials warned that hazardous conditions could rapidly change this status.
—
Hannah Parry, MSNBC Newsweek, 11 June 2025
The attempts to reach the group were not successful because of the hazardous conditions, so a boat was deployed to rescue the group, troopers said.
—Paloma Chavez, Miami Herald, 10 June 2025
Past Incidents in the last 12 hours: Traffic alert issued due to heavy rain conditions on eastbound K-10 in Lenexa A traffic warning has been issued for hazardous driving conditions due to heavy rain between South Cedar Creek Parkway and South Woodland Street on K-10.
—Kansas City Star, 9 June 2025
Navigating rainy roads: Safety tips for wet weather When heavy rain sets in, the risk of flooding and hazardous driving conditions rises.
—Bay Area Weather Report, Mercury News, 9 June 2025
See All Example Sentences for hazardous
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Hannah Parry, MSNBC Newsweek, 11 June 2025
The attempts to reach the group were not successful because of the hazardous conditions, so a boat was deployed to rescue the group, troopers said.
—Paloma Chavez, Miami Herald, 10 June 2025
Past Incidents in the last 12 hours: Traffic alert issued due to heavy rain conditions on eastbound K-10 in Lenexa A traffic warning has been issued for hazardous driving conditions due to heavy rain between South Cedar Creek Parkway and South Woodland Street on K-10.
—Kansas City Star, 9 June 2025
Navigating rainy roads: Safety tips for wet weather When heavy rain sets in, the risk of flooding and hazardous driving conditions rises.
—Bay Area Weather Report, Mercury News, 9 June 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 17 Jun. 2025.
Copy CitationKids Definition
hazardous
adjective
haz·ard·ous
ˈhaz-ərd-əs
hazardously
adverb
hazardousness
noun
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