0 impossible to see through or go through: --
1 impossible to enter or go through: --
As aspects of timbre are isolated and understood, such as spatial location and reverberation, these components come to be regarded separately, leaving timbre as impenetrable as ever.
His work was abstruse and impenetrable, his demeanor reserved, and his resistance to using the bully pulpit to comment on current economic events unprecedented.
In the stereotypical view, miners formed a 'breed apart': close-knit, class-conscious and impenetrable communities.
Even if vagueness in law were an impenetrable linguistic problem, we would not be allowed to conclude that vagueness makes law indeterminate.
While this reference to the woodcutter's or carpenter's arts is a tantalizing one, it is not impenetrable.
A centralised archive will facilitate access by other researchers and will be most helpful, particularly since research in this area often seems impenetrable.
Internally, electric alarms, concealed doors, hatches, trapdoors, and underground passages made for near impenetrable strongholds.
The cervical mucus plug usually acts as a barrier, which is impenetrable to bacteria during pregnancy.
