adj
hazardous
HA-z-dihs
adj
1
Dangerous; likely to cause harm.
"Workers must wear protective gear when handling hazardous chemicals."
"Driving in that fog was hazardous."
How to Use Hazardous
Learner’s notesIn plain EnglishRisky or dangerous, often used for substances, conditions, or activities.
Common pairings
hazardous waste
hazardous materials
hazardous conditions
Word Forms
more hazardous comparative, most hazardous superlative
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Workers must wear protective gear when handling _____ chemicals.
Etymology
From French hasardeux, built on "hazard" plus the adjective ending "-ous."