make undecipherable or imperceptible by obscuring or concealing; "a hidden message"; "a veiled threat"
If you obliterate something such as a memory, emotion, or thought, you remove it completely from your mind. There was time enough to obliterate memories of how things once were for him. = eradicate
If something obliterates an object or place, it destroys it completely. Their warheads are enough to obliterate the world several times over + obliteration oblit·era·tion the obliteration of three isolated rainforests