unsee

1. (chiefly in the negative) To undo the act of seeing something; to erase the memory of having seen something, or otherwise reverse the effect of having seen something.Examples: "We have shown the world, and it cannot be unseen, it cannot be unknown, it cannot be forgotten, that Christianity cannot be defended on any ground where Infidelity can get an inch of fair play against it."; "I have only seen the performance once; and I would not unsee it again if I could; but none the less I am a broken man after it."; "once you’ve seen this you bear always the burden of its sight. And, as Laura says, you can’t unsee it."