ultrahazardous
C2CEFR level
80/100Rarity: very rare
TechnicalRegister
Involving an inherently high risk of serious harm that no amount of care can eliminate.
Blasting with dynamite was treated as an ultrahazardous activity attracting strict liability.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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