dated(out of date) adjective [UK: ˈdeɪ.tɪd] [US: ˈdeɪ.təd]
passé(dated; out of style; old-fashioned) adjective [UK: ˈpæ.seɪ] [US: ˈpæ.seɪ]
отживялост noun
desuetude(state when something is no longer observed nor practised; an instance of this, see also: disuse; obsolescence) noun [UK: dɪ.ˈsjuːɪ.tjuːd] [US: dɪ.ˈsjuːɪ.tjuːd]