Definition of precipitous adjective from the Oxford Advanced American Dictionary

     

    precipitous

     adjective
    adjective
    NAmE//prɪˈsɪpət̮əs//
     
    (formal)
     
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  1. 1very steep, high, and often dangerous synonym sheer precipitous cliffs a precipitous drop at the side of the road
  2. 2sudden and great synonym abrupt a precipitous decline in exports
  3. 3done very quickly, without enough thought or care synonym hasty a precipitous action
precipitously
 
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adverb The land dropped precipitously down to the rocky shore. The dollar plunged precipitously. We don't want to act precipitously. see also precipice
See the Oxford Advanced Learner's Dictionary entry: precipitous