Word:

Impenetrable

Im`pen´e`tra`ble
a.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.
Adj.1.impenetrable - not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests"
Antonyms:
penetrable - admitting of penetration or passage into or through; "a penetrable wall"; "penetrable defenses"
2.impenetrable - permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom"
Synonyms: dense, heavy
3.impenetrable - impossible to understand; "impenetrable jargon"
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
Translate Impenetrable to German, Translate Impenetrable to French
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-- Impenetrable --
Impenetrableness
Impenetrably
Impenitence
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imperative language
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