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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.

im·pen′e·tra·ble·ness n.
im·pen′e·tra·bly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.impenetrableness - incomprehensibility by virtue of being too dense to understand
incomprehensibility - the quality of being incomprehensible
References in periodicals archive ?
By contrast, the Palestinian sovereignty is void, and it is only a shell of a sovereignty, not because it is lacking the ability to maintain cohesiveness and resistance to these regular violations by Israel, but, rather, in its being constructed, a priori, as porous, as deprived of this essential impenetrableness.
Titus finds himself kidnapped, transported and embroiled in political machinations that only enhance the impenetrableness of the prophecy he is (supposedly) destined to interpret and help fulfill.
We puny individuals have only 75, 80 or 96 years to look forward which is still a snap in the impenetrableness of time.