precipitous
adjectiveUK /prɪˈsɪp.ɪ.təs/
US /prɪˈsɪp.ə.t̬əs/
Very steep, like a cliff that goes almost straight up or down.
The hikers climbed a precipitous path up the mountain.
OTHER MEANINGS
2. Happening very quickly without enough thought.
The company made a precipitous decision to close the store.
3. Falling or dropping very suddenly and steeply.
The stock market took a precipitous fall yesterday.
4. Very dangerous or risky because it is so steep.
They avoided the precipitous edge of the canyon.