impenetrable

As an adjective impenetrable

is impenetrable.

As a letter x is

the twenty-fourth letter of the.

As a symbol x is

voiceless velar fricative.

As adjectives the difference between implausible and impenetrable

is that implausible is not plausible; unlikely; dubious while impenetrable is impenetrable.

As adjectives the difference between uncomprehensible and impenetrable

is that uncomprehensible is incomprehensible while impenetrable is impenetrable.

As adjectives the difference between insurmountable and impenetrable

is that insurmountable is incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle while impenetrable is impenetrable.

Strange is a related term of impenetrable.

As a proper noun strange

is .

As an adjective impenetrable is

impenetrable.

Exacting is a related term of impenetrable.

As adjectives the difference between exacting and impenetrable

is that exacting is making excessive demands; hard to satisfy while impenetrable is impenetrable.

As a verb exacting

is .

As adjectives the difference between permeable and impenetrable

is that permeable is permeable while impenetrable is impenetrable.

As adjectives the difference between impenetrable and translucent

is that impenetrable is not penetrable while translucent is allowing light to pass through, but diffusing it.

As a verb impede

is to get in the way of; to hinder.

As an adjective impenetrable is

impenetrable.

Impenetrable is a related term of undercover.

As adjectives the difference between impenetrable and undercover

is that impenetrable is impenetrable while undercover is performed or happening in secret.

As a noun undercover is

a person who works.