impervious - definition and synonyms

adjective 

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/ɪmˈpɜː(r)viəs/
  1. 1
    not affected by something or not seeming to notice it
    impervious to:

    She continued to work, apparently impervious to the midday heat.

    He carried on talking, impervious to the effect his words were having.

  2. 2
    science something that is impervious to a substance does not let the substance pass through it