precipitously

1. In a precipitous manner.

   Abruptly, perilously, sharply, steeply, severely

   In the west of Ireland, the Cliffs of Moher drop precipitously into the North Atlantic.

2. Abruptly; with no notice or ceremony: in a sudden or hasty manner, instantly, quickly.

   Shortly after the conversation turned to the results of the recent election, John silently stood from the table, and without explanation, precipitously walked out on the dinner party.

   unerwartet

   стреми́тельноstremítelʹno

   abruptly; in a precipitous manner

3. Done with a lack of proper decorum, or without adequate thought, care or concern for consequenses.

   In signing that contract without reading all of the provisions, I have performed what was a legal requirement most precipitously, leading me to wish that I had taken more care.

regular