UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌsuːpərˈænjʊˌeɪtɪd/

US:USA pronuncation: IPAUSA pronuncation: IPA/ˌsupərˈænjuˌeɪtɪd/

US:USA pronunciation: respellingUSA pronunciation: respelling(so̅o̅′pər anyo̅o̅ ā′tid)

From the verb superannuate: (⇒ conjugate)
superannuated is: Click the infinitive to see all available inflections
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed."
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked."

WordReference English Thesaurus © 2020
obsolete, passé, antiquated, outdated , old-fashioned , out-of-date, antique, archaic, disused

'superannuated' also found in these entries (note: many are not synonyms or translations):
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