An individual who fails to remember: An oblivion is one who is completely preoccupied with something difficult or has chosen to disregard and doesn't list to the topic.

Sometimes oblivions simply lack awareness of something or someone.

1. The condition or quality of being completely forgotten: Over the decades the existence of the hermit slipped into total oblivion and no one could recall him anymore.
2. The act or an instance of forgetting; total forgetfulness or unawareness: After working steadily for two days straight, Thomas fell into a state of oblivion and slept soundly for 12 hours.