porous

Etymology

From Old French poros, from Latin porus (“an opening”).

adj

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.
   However, Wolves 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. May 14, 2011, Peter Scrivener, “Sunderland 1 - 3 Wolverhampton”, in BBC Sport
3. (figurative, by extension) full of loopholes