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3 definitions found
 for impenetrable
From The Collaborative International Dictionary of English v.0.48 :

  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.
        [1913 Webster]
  
              Highest woods impenetrable
              To star or sunlight.                  --Milton.
        [1913 Webster]
  
     2. (Physics) Having the property of preventing any other
        substance from occupying the same space at the same time.
        [1913 Webster]
  
     3. Inaccessible, as to knowledge, reason, sympathy, etc.;
        unimpressible; not to be moved by arguments or motives;
        as, an impenetrable mind, or heart.
        [1913 Webster]
  
              They will be credulous in all affairs of life, but
              impenetrable by a sermon of the gospel. --Jer.
                                                    Taylor.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  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, impenetrable]
      3: impossible to understand; "impenetrable jargon"

From Moby Thesaurus II by Grady Ward, 1.0 :

  115 Moby Thesaurus words for "impenetrable":
     Greek to one, ambiguous, arcane, beyond reach,
     beyond understanding, cabalistic, close, close-knit,
     close-textured, close-woven, closed forever to, closed to, compact,
     compacted, compressed, concentrated, concrete, condensed,
     congested, consolidated, crammed, crammed full, crowded, dense,
     exuberant, firm, flourishing, gluey, gross, hard, heavy, holeproof,
     impassable, impermeable, impervious, impregnable, inaccessible,
     inarticulate, incognizable, incoherent, incomprehensible,
     incontestable, indomitable, inexpugnable, inscrutable, insuperable,
     invincible, inviolable, invulnerable, irresistible, jam-packed,
     jammed, jungled, jungly, lost to, lush, luxuriant, massive, mystic,
     nonporous, nonpuncturable, numinous, out of reach, overgrown,
     overpowering, overrun, overwhelming, packed, past comprehension,
     punctureproof, rambling, rank, resistless, riotous, serried, solid,
     substantial, thick, thick-growing, thickset, un-come-at-able,
     unaccessible, unaccountable, unapproachable, unassailable,
     unattainable, unavailable, unbeatable, unconnected, unconquerable,
     undiscoverable, unfathomable, ungettable, ungraspable, unguessed,
     unintelligible, unknowable, unobtainable, unpassable, unperforable,
     unpierceable, unprocurable, unreachable, unsearchable, unsecurable,
     unsubduable, unsurmountable, unweeded, unyielding, viscid, viscose,
     viscous, weed-choked, weed-ridden, weedy
  
  

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