/ ˈhæzədəs; NAmE -ərdəs/ adjective
involving risk or danger, especially to sb's health or safety :
hazardous waste / chemicals
a hazardous journey
It would be hazardous to invest so much.
a list of products that are potentially hazardous to health
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WORD ORIGIN
mid 16th cent.: from French hasardeux , from hasard chance, from Spanish azar , from Arabic az-zahr chance, luck, from Persian zār or Turkish zar dice.