Iron and Impregnable

Iron adjective - Not showing weakness or uncertainty.

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

Nearby Words: ironing, ironed, ironware, ironwork

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

Iron and impregnable are semantically related. Sometimes you can use "Iron" instead an adjective "Impregnable".

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