impregnable

As adjectives the difference between impermeable and impregnable

is that impermeable is waterproof while impregnable is too strong to be penetrated or impregnable can be capable of being impregnated.

As a noun impermeable

is raincoat.

As adjectives the difference between imponderable and impregnable

is that imponderable is imponderable while impregnable is too strong to be penetrated or impregnable can be capable of being impregnated.

As a noun imponderable

is imponderable, intangible.

As adjectives the difference between obstinate and impregnable

is that obstinate is stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent while impregnable is too strong to be penetrated or impregnable can be capable of being impregnated.

As adjectives the difference between impregnable and infertile

is that impregnable is too strong to be penetrated or impregnable can be capable of being impregnated while infertile is not fertile.

As adjectives the difference between staunch and impregnable

is that staunch is loyal, trustworthy, reliable, outstanding while impregnable is too strong to be penetrated or impregnable can be capable of being impregnated.

As a verb staunch

is to stop the flow of (blood).

As adjectives the difference between impregnable and impetuous

is that impregnable is too strong to be penetrated while impetuous is making arbitrary decisions, especially in an impulsive and forceful manner.

As adjectives the difference between impregnatable and impregnable

is that impregnatable is which can be impregnated while impregnable is too strong to be penetrated.

As adjectives the difference between impregnable and pregnant

is that impregnable is too strong to be penetrated while pregnant is carrying developing offspring within the body.

As a noun pregnant is

a pregnant woman.

As adjectives the difference between relentless and impregnable

is that relentless is unrelenting or unyielding in severity while impregnable is too strong to be penetrated or impregnable can be capable of being impregnated.