Did Not Finish.
To me, that’s the worst thing you can say about a book. It means there wasn’t enough there for you to get through it. The plot and the characters and the world and the writing weren’t enough. Not one single aspect. As an aspiring author, I think that would be the worst review I could get, worse even than a one-star. At least a one-star reviewer got through the book.
So I hate DNF-ing books. Hate it.
But recently, I’ve been doing it more often.