| a. | 1. | Capable of being penetrated, entered, or pierced. Used also figuratively. |
| Adj. | 1. | penetrable - admitting of penetration or passage into or through; "a penetrable wall"; "penetrable defenses" Antonyms: impenetrable - not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests" |
| 2. | penetrable - capable of being penetrated; "penetrable defenses" |