precipitous Synonyms

abrupt precipitant sharp impetuous subitaneous heedless headlong hasty precipitate overhasty prerupt sheer rock-bound rushed reckless rash rapid quick premature steepdown speedy steep devil-may-care hotheaded vertical unexpected swift sudden steep-to unanticipated lacking foresight steeper ill-considered perpendicular downhill dizzy declivitous craggy careless brant bold bluff arduous alpine expeditious FAST high breakneck orthodiagonal mountainous