It is generally penetrable only through cuts or tiny abrasions.
The interior hull is an open cavity penetrable only from below.
The more penetrable the screen is, the shorter the distance to the point of maximum wind velocity and the lower the protection.
Occlusion not penetrable by the infusion guide wire.
Residential buildings are typically constructed of wood and other materials easily penetrable by radio waves.
Larger armor panels may be slightly more penetrable.
Word Origin and History for penetrable
early 15c., "penetrating," from Latin penetrabilis "penetrable, vulnerable," from penetrare (see penetrate). Meaning "capable of being penetrated" is attested from 1530s; figurative use by 1590s. Related: Penetrability.