precipitously
adv. 陡峭地；出乎意料地；陡然地
例句
The ground beyond the road fell away precipitously.
该路外面的地面陡然下降。
《柯林斯英汉双解大词典》
The dollar plunged precipitously.
美元直线下跌。
《牛津词典》
We don't want to act precipitously.
我们不想仓促行事。
