porous

adjective2

1. •
   Full of tiny pores that allow fluids or gasses to pass through.

   • Sponges are porous so they can filter water while trapping food.
   • Concrete is porous, so water will slowly filter through it.
2. •
   (figurative) With many gaps or loopholes.

   • However, Wolves ^([sic]) porous defence opened up again to gift Sunderland a foothold in the game - Sessegnon sweeping in a Zenden corner that was inexplicably allowed to bounce in the six-yard box. — 2011