Synonyms for Oblivion:

n.

block, carelessness, forgetful, indifference, memory, mental block, remembrance, Absent-minded, senior moment, get/become lost (in something), slip through the net/cracks, something goes in one ear and out the other. absent, abstracted, distant, escape, inattentive, neglectful, preoccupied, spaced-out, vacantly, in a dream, in a world of your own. death (noun)
obliteration.
forgetfulness (noun)
amnesia, blankness, erasure, forgetfulness, obliteration.
ignorance (noun)
insensitivity, obliviousness.
insensibility (noun)
aloofness, anesthesia, callousness, coma, deadness, dullness, faintness, insensibility, insensitivity, insentience, narcosis, numbness, obliviousness, senselessness, stupor, swoon, trance, unconsciousness, unfeelingness, Sopor.
mental blankness (noun)
amnesia, carelessness, forgetfulness, indifference, insensibility, obliviousness, unconsciousness.
nothingness (noun)
being, emptiness, existence, fullness, nonexistence, nothing, obscurity, void, Nihility.
nothingness, obscurity (noun)
emptiness, limbo, nonexistence, nothing, void, Nihility.
oblivion (noun)
limbo, obliviousness.

Other synonyms:

block, forgetful, mental block, nonexistence, nothing, Absent-minded, senior moment. escape. Other relevant words:
block, carelessness, emptiness, escape, indifference, limbo, nonexistence, nothing, obscurity, void, Nihility.

Usage examples for oblivion

  1. The more she tried to look bright in the day, the more impossible it seemed to forget her troubles in the temporary oblivion of a sound sleep. – A Christmas Posy by Mary Louisa Stewart Molesworth
  2. The Minister of Police now informed him that, from the mutilated state of his body, and from the sufferings he had gone through, he must be convinced that it was not the intention of the French Government ever to restore him to his native country, where he might relate occurrences which the policy of France required to be buried in oblivion he, therefore, had no choice between serving the Emperor of the French, or perishing within the walls of the prison where he was confined. – The Project Gutenberg Memoirs of Napoleon Bonaparte by Bourrienne, Constant, and Stewarton
  3. Oblivion hides the rest. – Poems with Power to Strengthen the Soul by Various