UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/dɪˈsjuːɪˌtjuːd/, /ˈdɛswɪtjuːd/

US:USA pronunciation: respellingUSA pronunciation: respelling(deswi to̅o̅d′, -tyo̅o̅d′)

WordReference Random House Unabridged Dictionary of American English © 2020
des•ue•tude  (deswi to̅o̅d′, -tyo̅o̅d′),USA pronunciation n. 
  1. the state of being no longer used or practiced.
  • Latin dēsuētūdo, equivalent. to dēsuē-, base of dēsuēscere to become disaccustomed to, unlearn (dē- de- + suēscere to become accustomed to) + -tūdō -tude
  • late Middle English 1425–75

Collins Concise English Dictionary © HarperCollins Publishers::
desuetude /dɪˈsjuːɪˌtjuːd; ˈdɛswɪtjuːd/ n
  1. formal the condition of not being in use or practice; disuse: those ceremonies had fallen into desuetude
Etymology: 15th Century: from Latin dēsuētūdō, from dēsuescere to lay aside a habit, from de- + suescere to grow accustomed
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