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Ultrahazardous is an adjective.
From the Scrabble dictionary:
amadous
apodous
decapodous
hazardous
horrendous
iodous
molybdous
nodous
nonhazardous
palladous
stupendous
tremendous
ultrahazardous
uropodous
vanadous
vodous
"anaerobic" activity is activity without oxygen.
Antagonist activity is the activity that is counter to the agonist or it can be viewed as an inhibitory activity. If pharmacology, the antagonist does not have any activity, but it blocks or inhibits the activity of the agonist.
i believe that the levels of economic activity is
1.primary activity
2.secondary activity
3.tertiary activity
4.quaternary activity