Looks like a quitter to me, but I put question marks on any eggs I have my doubts about them hatching. About 1 out of 12 question-marked eggs actually hatched!
I wouldn't toss it just yet. Maybe see on day 14 or so.
That's either dead or will be soon, IMO. I had two that looked like that on my most recent hatch. They developed about half way, slower than the others, and then quit.