Definition of pestilential adjective from the Oxford Advanced American Dictionary

     

    pestilential

     adjective
    adjective
    NAmE//ˌpɛstəˈlɛnʃl//
     
     
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  1. 1[only before noun] (literary) extremely annoying
  2. 2(old use) connected with or causing a pestilence
See the Oxford Advanced Learner's Dictionary entry: pestilential