ultrahazardous
adjective
ul·tra·haz·ard·ous
| \ ˌəl-trə-ˈha-zər-dəs
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Definition of ultrahazardous
: involving an extremely large risk (as of loss or harm) : extremely or extraordinarily hazardous
ultrahazardous waste Under American law, in all likelihood, the operation of this plant to manufacture methyl isocyanate would be classified as an ultrahazardous activity …— William J. Curran
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