adj.

1. Impossible to penetrate or enter: an impenetrable fortress.
2. Impossible to understand; incomprehensible: impenetrable jargon.
3. Impervious to sentiment or argument: an impenetrable heart.

impenetrableness im·pen'e·tra·ble·ness n.
impenetrably im·pen'e·tra·bly adv.

adjective

Incapable of being grasped by the intellect or understanding: incomprehensible, inscrutable, uncomprehensible, unfathomable, unintelligible. See knowledge/ignorance.

adj

Definition: dense
Antonyms: clear, penetrable, permeable, porous, soft, sparse, thin

adj

Definition: incomprehensible
Antonyms: accessible, comprehensible, intelligible, penetrable, understandable

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IN BRIEF: Unable to be pieced. Or unable to be comprehended.

We can see well into the past; we can guess shrewdly into the future; but that which is rolled up and muffled in impenetrable folds is today. — Ralph Waldo Emerson (1803-1882), American transcendentalist philosopher, essayist and lecturer.

Dansk (Danish)
adj. - uigennemtrængelig, uforståelig, upåvirkelig

Nederlands (Dutch)
ondoordringbaar, ontoegankelijk, ondoorgrondelijk

Français (French)
adj. - impénétrable, insondable, hermétique

Deutsch (German)
adj. - unzugänglich, undurchdringlich, unergründlich

Ελληνική (Greek)
adj. - αδιαπέραστος, ανεξιχνίαστος

Italiano (Italian)
inaccessibile, impenetrabile

Português (Portuguese)
adj. - impenetrável

Русский (Russian)
непроницаемый, недоступный, беспросветный, не поддающийся влиянию

Español (Spanish)
adj. - impenetrable, inaccesible, hermético

Svenska (Swedish)
adj. - ogenomtränglig (äv. bildl.), outgrundlig, otillgänglig, känslolös

中文（简体） (Chinese (Simplified))
不能穿过的, 费解的, 不可理喻的

中文（繁體） (Chinese (Traditional))
adj. - 不能穿過的, 費解的, 不可理喻的

한국어 (Korean)
adj. - 뚫을 수 없는, 헤아릴 수 없는, 완고한

日本語 (Japanese)
adj. - 突き通せない, 通れない, 見通せない, 測り知れない, 受け付けない, 頑固な, 鈍感な, 入り込めない

العربيه (Arabic)
‏(صفه) لا يخترق‏

עברית (Hebrew)
adj. - ‮בלתי-חדיר, שאין להבינו, בלתי ניתן להשפעה ע"י רעיונות, אטום לנוזלים, שלא ניתן לעברו‬

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