impenetrable : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: impenetrable	by the DICT Development Group
2 results for impenetrable
From WordNet (r) 3.0 (2006) [wn]:
impenetrable adj not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests" Antonym(s): penetrable permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom" Synonym(s): dense, heavy, impenetrable impossible to understand; "impenetrable jargon"
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Impenetrable \Impen"etrable\, a. [L. impenetrabilis; pref. im- not + penetrabilis penetrable: cf. F. imp[82]n[82]trable.] 1. Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable* shield. Highest woods impenetrable To star or sunlight. --Milton. 2. (Physics) Having the property of preventing any other substance from occupying the same space at the same time. 3. Inaccessible, as to knowledge, reason, sympathy, etc.; unimpressible; not to be moved by arguments or motives; as, an impenetrable mind, or heart. They will be credulous in all affairs of life, but impenetrable by a sermon of the gospel. --Jer. Taylor.