precipitously

adverb4

1. •
   In a precipitous manner.
2. •
   Abruptly, perilously, sharply, steeply, severely

   • In the west of Ireland, the Cliffs of Moher drop precipitously into the North Atlantic.
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.
   • Look here son, in stealing that candy bar from Belsito's market, you have acted precipitously in the extreme; now you will have the unenviable responsibility of telling Mr. Belsito what you have done, and of expressing your heartfelt regret.
4. •
   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.