impenetrable

Impenetrable is a related term of obdurate.

As adjectives the difference between impenetrable and obdurate

is that impenetrable is impenetrable while obdurate is stubbornly persistent, generally in wrongdoing; refusing to reform or repent.

Congested is a related term of impenetrable.

As a verb congested

is (congest).

As an adjective impenetrable is

impenetrable.

Impenetrable is a related term of secretive.

As adjectives the difference between impenetrable and secretive

is that impenetrable is impenetrable while secretive is having an inclination to secrecy.

As adjectives the difference between impenetrable and unsusceptible

is that impenetrable is not penetrable while unsusceptible is not susceptible.

Stuffed is a related term of impenetrable.

As adjectives the difference between stuffed and impenetrable

is that stuffed is full (with), or packed (with some material or substance) while impenetrable is impenetrable.

As a verb stuffed

is (stuff).

Confined is a related term of impenetrable.

As adjectives the difference between confined and impenetrable

is that confined is not free to move while impenetrable is impenetrable.

As a verb confined

is (confine).

Complicated is a related term of impenetrable.

As adjectives the difference between complicated and impenetrable

is that complicated is difficult or convoluted while impenetrable is impenetrable.

As a verb complicated

is (complicate).

In figuratively terms the difference between covert and impenetrable

is that covert is secret, surreptitious, concealed while impenetrable is incomprehensible; inscrutable.

As adjectives the difference between covert and impenetrable

is that covert is hidden, covered over; overgrown, sheltered while impenetrable is not penetrable.

As a noun covert

is area of thick undergrowth where animals hide.

Impenetrable is a related term of surreptitious.

As adjectives the difference between impenetrable and surreptitious

is that impenetrable is impenetrable while surreptitious is stealth]]y, furtive, [[hidden|well hidden, covert (especially movements).

Clandestine is a related term of impenetrable.

As adjectives the difference between clandestine and impenetrable

is that clandestine is done or kept in secret, sometimes to conceal an illicit or improper purpose while impenetrable is impenetrable.