Certain and Impregnable

Certain adjective - Known but not named.

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

Nearby Words: certainty, certainly

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

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

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