1. (a.) Steep, like a precipice; as, a precipitous cliff or mountain; hasty or headlong; as, precipitous fall.

2. (a.) Hasty; rash; quick; sudden; precipitate; as, precipitous attempts.

abrupt accident-prone acclivitous arduous bluff bold breakneck breathless careless declivitous desperate devil-may-care electrifying furious harum-scarum hasty headlong hotheaded hurried impetuous impulsive mad nerve-shattering orthodiagonal orthogonal overeager overenthusiastic overzealous panting perpendicular plumb plunging precipitant precipitate quick rapid rash reckless right-angle right-angled right-angular rushing sharp sheer shocking sideling slap-bang slapdash speedy startling steep stickle straight-up straight-up-and-down sudden surprising swift unanticipated unexpected unforeseen unlooked-for unpredicted up-and-down vertical wanton wild