This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. abruptly; in a precipitous manner

In a precipitous manner; with sudden descent; in violent haste.

Hastily; with precipitation; precipitately.

ad. very suddenly and to a great degree

ad. abruptly; in a precipitous manner

"F Neal Pitt, the second-leading rebounder in the MEAC last season, missed seven games due to injury and saw his numbers (7.4 points, 5.9 rebounds) decline precipitously from the 16 points and 8.1 rebounds he averaged last season."