loss of memory about something (outdated)
oblivion
vanished, disappeared, lost, gone, sunk into oblivion
Его имя было обречено на забвение
His name was doomed to oblivion.
Она погрузилась в глубокое забвение
She sank into deep oblivion.
Прошлое ушло в забвение навсегда
The past disappeared into oblivion forever.
Он вспоминал о канувшей в забытьё юности.
He remembered his youth, which had faded into oblivion.
