Impregnable and Proof

Impregnable adjective - Incapable of being defeated, overcome, or subdued.

Proof and impregnable are semantically related. In some cases you can use "Proof" instead an adjective "Impregnable".

Nearby Words: impregnate, impregnation, impregnated, impregnability, impregnating

Proof adjective - (used in combination or as a suffix) able to withstand.

Impregnable and proof are semantically related. Sometimes you can use "Impregnable" instead an adjective "Proof".

Nearby Words: proofed, proofing