WORD: Desuetude
[des-wi-tood, -tyood ] [noun] The state of being no longer used or practiced. A very few people, not appearing to be up to much, sat far apart at desks in a dimly lighted panorama of desuetude. PETER SCHJELDAHL, "THE VILLAGE VOICE'S MAGIC MIRROR," THE NEW YORKER, SEPTEMBER 2, 2018 The practice of “leaving a calling card” may have fallen into desuetude among human beings, but as a description of pet behavior the phrase continues to have legs. CULLEN MURPHY, "ANTICIPATION," THE ATLANTIC, NOVEMBER 1998