Translation

性急に / 軽率に / 突如として

Meaning

Acting or happening with excessive speed, often without careful thought or preparation, frequently leading to negative or unexpected outcomes.

Examples

• The company's stock price fell precipitately.
  The company's stock price fell precipitately.
• He resigned precipitately, without considering the impact on his team.
  He resigned precipitately, without considering the impact on his team.