ultrahazardous

adjective
ul·tra·haz·ard·ous | \ˌəl-trə-ˈha-zər-dəs \

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

First Known Use of ultrahazardous

1886, in the meaning defined above

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The first known use of ultrahazardous was in 1886

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More Definitions for ultrahazardous

ultrahazardous

adjective
ul·tra·haz·ard·ous | \ˌəl-trə-ˈha-zər-dəs\

Legal Definition of ultrahazardous 

: being of such extreme danger or risk of harm that strict liability will be imposed

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