English to English
impenetrable
(/I/m'p/E/n/I/tr/@/b/@/l
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adjective (a)
not admitting of penetration or passage into or through(adj.all)
Example:
An impenetrable fortress.
Impenetrable rain forests.
source: wordnet30
Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield.(adjective)
source: webster1913
adjective satellite (s)
permitting little if any light to pass through because of denseness of matter(adj.all)
Example:
Impenetrable gloom.
source: wordnet30
impossible to understand(adj.all)
Example:
Impenetrable jargon.
source: wordnet30