A person who neglects, or takes no notice of something(noun)
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Use "neglecter" in a sentence
"Then the scholar we are speaking of, a neglecter rather than an inspecter of books, will stuff his volume with violets, and primroses, with roses and quatrefoil."
"Sunday, Nov. 13, 2005, 7: 26 p.m. I don't have time to say much tonight because Incompetent Co-worker is going to be here soon to claim this computer, but before I make like a baby and head out for the night, I have a few pictures that I can post here so I don't feel like a diary-neglecter."
"The will of God, by which he wills religion to be performed to himself, and that he who performs it be rewarded; and, on the contrary, that the neglecter of it be punished."