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impenetrable

adjective

/ɪmˈpɛn.ɪ.trə.bəl/

Meaning

Impossible to pass through or enter; impossible to understand.

The dense forest was nearly impenetrable.

impenetrable barrier

inaccessible, unpassable, impervious, obscure, incomprehensible

penetrable, understandable, clear

impenetrable forest, impenetrable wall, impenetrable mystery, impenetrable defense

belonging naturally; essential or inherent

Feeding only on plants.

Greatest or highest in degree, importance, or extent.

Showing a lack of respect for things that are generally taken seriously.

Aggressively active in a cause, sometimes using forceful methods.

honest and open; not complicated; easy to understand