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  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Impervious  \Im*per"vi*ous\,  a.  [L.  impervius;  pref.  im-  not  + 
  per  through  +  via  way  See  {Voyage}.] 
  Not  pervious;  not  admitting  of  entrance  or  passage  through 
  as  a  substance  impervious  to  water  or  air. 
 
  This  gulf  impassable,  impervious.  --Milton. 
 
  The  minds  of  these  zealots  were  absolutely  impervious. 
  --Macaulay. 
 
  Syn:  Impassable;  pathless;  impenetrable;  imperviable; 
  impermeable.  --  {Im*per"vi*ous*ly},  adv  -- 
  {Im*per"vi*ous*ness},  n. 
 
  From  WordNet  r  1.6  [wn]: 
 
  imperviousness 
  n  :  resistance  to  penetration  by  a  liquid  [syn:  {impenetrability}] 
  [ant:  {penetrability},  {penetrability}] 

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