Nonextant and Old-hat

Nonextant adjective - No longer existing.

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

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

Nonextant and old-hat are semantically related. Sometimes you can use "Nonextant" instead an adjective phrase "Old-hat".