permeable

adj

1. Able to be permeated; absorbing or allowing the passage of fluids.

   “permeable strata”

   “Rainwater sinks through permeable rock to form an underground reservoir.”

   “One hundred thirty-one small, highly permeable masonry wall specimens built of concrete blocks or of bricks were treated with cement-water paints or with other waterproofings.”

2. (broadly)Allowing the passage of persons, information, or other things, especially when such passage occurs despite hopes or expectations otherwise.

   “permeable borders”

   “permeable boundaries”