Dangerously steep (11)

I believe the answer is:
precipitous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dangerously steep</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for precipitous that I've seen before include "Quick dropping" , "Steep - hasty" , "Dangerously high or steep" .)