impenetrability
Cannot be pierced
Impenetrability is the quality of being impossible to pass through, pierce, or enter.
A fortress has impenetrability when no enemy can breach its walls.
The term extends to abstraction: the impenetrability of legal jargon, the impenetrability of his expression.
In physics, impenetrability refers to the principle that two bodies cannot occupy the same space simultaneously.
Being impossible to grasp
- obscurityState of being unknown
- complexityState of being complicated
- abstrusenessDifficult to understand
- opacityImpermeability to light
unintelligibility · inscrutability · indecipherability · convolution · density · jargon · esoteric · arcane
Mass-to-volume ratio
- solidityFirmness of structure
- thicknessDepth of material
- hardnessResistance to penetration
- armorProtective combat covering
barrier · fortress · wall · shield · impermeability · resistance · toughness · durability
Something unexplained or unknown
- enigmaSomething hard to fathom
- inscrutabilityImpossible to understand
- veiledConcealed or obscured
- hiddenKept out of sight
secrets · clandestine · covert · closed · guarded · sphinxlike · poker-faced · unreadable
incomprehensibility
Being impossible to grasp
- obscurityState of being unknown
- complexityState of being complicated
- abstrusenessDifficult to understand
opacity · unintelligibility · inscrutability · indecipherability · convolution · density · jargon · esoteric · arcane · cryptic
density
Mass-to-volume ratio
armor · barrier · fortress · wall · shield · impermeability · resistance · toughness · durability · reinforcement
mystery
Something unexplained or unknown
- enigmaSomething hard to fathom
- inscrutabilityImpossible to understand
- veiledConcealed or obscured
hidden · secrets · clandestine · covert · closed · guarded · sphinxlike · poker-faced · unreadable · inscrutable
fortification
Strengthening defenses or nutrients
- strongholdFortified place of defense
- citadelFortified urban stronghold
- bastionFortified defensive position
bulwark · rampart · bunker · fortress · barricade · palisade · redoubt · moat · impregnable · unbreachable
- protectedprotected, shielded, guarded, secured, safe
- mysteriousnessenigma, mystique, inscrutability, obscurity, crypticness
- inscrutabilitymystery, enigma, opacity, incomprehensibility, unknowability
- unclearnessvagueness, ambiguity, obscurity, haziness, fuzziness
impenetrabilitypermeability
Ability to transmit fluids
penetrability · porosity · permeableness · absorbency · openness
impenetrabilityclarity
State of being understandable
transparency · intelligibility · comprehensibility · understandability · lucidity
impenetrabilityopenness
Quality of being accessible
accessibility · approachability · transparency · vulnerability · warmth
penetrating, penetrate, impenetrable, penetration, penetrable, penetrative, impenetrably, penetrator, penetrability