äkkisyvä, äkkijyrkkä
äkillinen
jyrkkä
äkkijyrkkä
Steep, like a precipice
(ux)
(quote-book)
Headlong
Hasty; rash; quick; sudden
(quote-journal)humans have been responsible for a precipitous decline of elephants, from perhaps 300,000 in the early 1970s to some 10,000 today.