1. having tiny holes that allow air or liquid to pass through
2. having weaknesses or gaps that allow things to pass through easily
Usage: figurative

Examples

• The porous rock absorbed water like a sponge.
• Pumice is a very porous volcanic stone.
• The porous membrane filters out impurities.
• Her porous skin required extra moisturizer.
• The border security was porous and easily crossed.
• The porous defense allowed three goals in the first half.
• Clay pots are porous and allow plants to breathe.