impenetrable

Impenetrable is a related term of knotty.

As adjectives the difference between impenetrable and knotty

is that impenetrable is impenetrable while knotty is full of knots.

Impenetrable is a related term of callous.

As adjectives the difference between impenetrable and callous

is that impenetrable is impenetrable while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

Troublesome is a related term of impenetrable.

As adjectives the difference between troublesome and impenetrable

is that troublesome is giving trouble or anxiety; vexatious; burdensome; wearisome while impenetrable is impenetrable.

As a verb overpower

is to subdue someone by superior force.

As an adjective impenetrable is

impenetrable.

As adjectives the difference between impenetrable and unnavigable

is that impenetrable is impenetrable while unnavigable is (nautical) not navigable; impossible to sail through.

As adjectives the difference between impenetrable and untraversable

is that impenetrable is impenetrable while untraversable is cannot be traversed.

As adjectives the difference between impenetrable and bulletproof

is that impenetrable is not penetrable while bulletproof is capable of withstanding a direct shot by a bullet fired from a gun.

As a verb bulletproof is

to make proof against bullets.

As adjectives the difference between impenetrable and illegible

is that impenetrable is not penetrable while illegible is not clear enough to be read; unreadable; not legible or decipherable.

Impenetrable is a related term of imperviable.

As adjectives the difference between impenetrable and imperviable

is that impenetrable is impenetrable while imperviable is impervious.

is likely misspelled.

has no English definition.

As an adjective impenetrable

is not penetrable.