Outdated and Old-hat

Outdated adjective - Having passed its time of use or usefulness.

Old-hat and outdated are semantically related In some cases you can use "Old-hat" instead an adjective "Outdated".

Old-hat adjective - Repeated too often; overfamiliar through overuse.

Outdated and old-hat are semantically related in old-fashioned topic. Sometimes you can use "Outdated" instead an adjective phrase "Old-hat", if it concerns topics such as antiquated.