Hypertext Webster Gateway: "Impenetrable"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Impenetrable \Im*pen"e*tra*ble\, a. [L. impenetrabilis; pref.
im- not + penetrabilis penetrable: cf. F.
imp['e]n['e]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.
From WordNet (r) 1.7 (wn)
impenetrable
adj 1: not admitting of penetration or passage into or through; "an
impenetrable fortress"; "impenetrable rain forests"
[ant: {penetrable}]
2: permitting little if any light to pass through because of
denseness of matter; "dense smoke"; "heavy fog";
"impenetrable gloom" [syn: {dense}, {heavy}]
3: impossible to understand; "impenetrable jargon"
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