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
This may result in slick and hazardous driving conditions.
—
Ca Weather Bot, Sacbee.com, 1 Apr. 2025
However, a small portion of them, known as potentially hazardous asteroids (PHAs), do require closer observation.
—Josh Hammer, MSNBC Newsweek, 1 Apr. 2025
More snow is on the way and will create hazardous travel conditions, forecasters said.
—Lauren Penington, Denver Post, 1 Apr. 2025
Traditional methods are time consuming, require a great deal of energy and involve handling hazardous chemicals.
—Noël Fletcher, Forbes.com, 30 Mar. 2025
See All Example Sentences for hazardous
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Ca Weather Bot, Sacbee.com, 1 Apr. 2025
However, a small portion of them, known as potentially hazardous asteroids (PHAs), do require closer observation.
—Josh Hammer, MSNBC Newsweek, 1 Apr. 2025
More snow is on the way and will create hazardous travel conditions, forecasters said.
—Lauren Penington, Denver Post, 1 Apr. 2025
Traditional methods are time consuming, require a great deal of energy and involve handling hazardous chemicals.
—Noël Fletcher, Forbes.com, 30 Mar. 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 6 Apr. 2025.
Copy CitationKids Definition
hazardous
adjective
haz·ard·ous
ˈhaz-ərd-əs
hazardously
adverb
hazardousness
noun
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