precipitous (adj.)
- 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
- orthogonal
- overeager
- overenthusiastic
- overzealous
- perpendicular
- plumb
- precipitant
- precipitate
- quick
- rapid
- rash
- reckless
- right-angled
- rushing
- sharp
- sheer
- shocking
- slapdash
- speedy
- startling
- steep
- sudden
- surprising
- swift
- unanticipated
- unexpected
- unforeseen
- unlooked-for
- unpredicted
- vertical
- wanton
- wild
