Impregnable and Sound

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

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

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

Sound adjective - According to the rules of logic.

Impregnable and sound are semantically related. Sometimes you can use "Impregnable" instead an adjective "Sound".

Nearby Words: sounded, soundness, soundly, sounding, sounder