unsee

verb

Etymology: From un- + see. Compare Middle English unseen, unsen (“to fail to see, be unable to see”).

1. To undo the act of seeing something; to erase the memory of having seen something, or otherwise reverse the effect of having seen something.

   “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.”