precipitous

adjectives

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, precipitant, precipitate, precipitous
is derived from
precipitousness
extremely steep
"an abrupt canyon"; "the precipitous rapids of the upper river"; "the precipitous hills of Chinese paintings"; "a sharp drop"
abrupt, precipitous, sharp
is derived from
precipitousness
is derived from
precipice