- 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.
- (Of legislation) full of loopholes
- (figuratively) With many gaps.
- 2011 May 14, Peter Scrivener, “Sunderland 1 - 3 Wolverhampton”, in BBC Sport:
- 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.
- (full of holes): permeable
full of tiny pores
full of loopholes
(figuratively) with many gaps