Definition of impervious adjective from the Oxford Advanced American Dictionary

     

    impervious

     adjective
    adjective
    NAmE//ɪmˈpərviəs//
     
     
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  1. 1impervious to something not affected or influenced by something impervious to criticism/pain
  2. 2(technology) not allowing a liquid or gas to pass through an impervious rock/layer impervious to something impervious to moisture
See the Oxford Advanced Learner's Dictionary entry: impervious