a.[(+to)]

1. 不能透过的，不能渗透的
   a fabric impervious to moisture

   防潮织品

2. 不受影响的；不为所动的；无动于衷的
   Despite the glibness of his tongue, I am still impervious to his persuasion.

   尽管他说得天花乱坠，我还是对他的说法无动于衷。

   He is impervious to criticism.

   他不为批评所动。

adj.

1. not allowing fluid to pass through.
2. (impervious to) unable to be affected by.