precipitous in WordNet English dictionary

1. extremely steep
   "an abrupt canyon"; "the precipitous rapids of the upper river"; "the precipitous hills of Chinese paintings"; "a sharp drop"
   abrupt  precipitous  sharp 
   
2. done with very great haste and without due deliberation
   "hasty marriage seldom proveth well"- Shakespeare; "hasty makeshifts take the place of planning"- Arthur Geddes; "rejected what was regarded as an overhasty plan for reconversion"; "wondered whether they had been rather precipitate in deposing the king"
   hasty  overhasty  precipitate  precipitant  precipitous