precipitous UK US /prɪˈsɪpɪtəs/ adjective
► if a reduction is precipitous, it happens very suddenly and is very big: a precipitous decline/drop/fall »
The company has seen a precipitous decline in advertising revenue.
► done too quickly without thinking enough about any possible problems: »
a precipitous decision
precipitously adverb
► »
Manufacturing has fallen precipitously.
Financial and business terms. 2012.