Die-hard and Through and through

Die-hard adjective - Tending to favor established ideas, conditions, or institutions.

Through and through and die-hard are semantically related In some cases you can use "Through and through" instead an adjective phrase "Die-hard".

Through and through adverb - To a full extent or degree.

Die-hard and through and through are semantically related in deep-rooted topic. Sometimes you can use "Die-hard" instead an adjective phrase "Through and through".