- Incapable of being penetrated or pierced; not
admitting the passage of other bodies; not to be entered; impervious;
as, an impenetrable shield. - Having the property of preventing any other substance
from occupying the same space at the same time. - Inaccessible, as to knowledge, reason, sympathy,
etc.; unimpressible; not to be moved by arguments or motives; as, an
impenetrable mind, or heart.
Meaning of 'impenetrable' (Princeton's WordNet)
1 . impenetrable
[ a]
Meaning (1): - not admitting of penetration or passage into or through
Example in sentence:
an impenetrable fortress;
impenetrable rain forests
2 . impenetrable
[ s]
Meaning (2): - permitting little if any light to pass through because of denseness of matter