oblivion oblivion /əˈblɪviːən/

noun

1. () The state of being disregarded or forgotten  ( limbo , oblivion )
   the state of being disregarded or forgotten
   
2. Total forgetfulness  ( oblivion , obliviousness )
   total forgetfulness
    He sought the great oblivion of sleep
   he sought the great oblivion of sleep