pervious

Often followed by to: capable of being penetrated by another body or substance, such as air or water; admitting passage.

Capable of being seen through; open to being examined; patent, unconcealed.

Capable of being penetrated mentally; intelligible, understandable.

Of a person, etc.: susceptible to being influenced by arguments, ideas, etc.; impressionable, tractable.

Capable of penetrating or permeating.

Of a body structure (especially the nostril of a bird): having a hole, perforate; also, wide open.