You wanted to read the book, you were excited to crack it open, you came into it with good faith and anticipation… but you ended up dnf-ing it. Which book and why?
Mine was The Maid by Nita Prose. It was for my book club and looked like a fun murder mystery. Instead I got instant manic-pixie-dream-neurodivergent-girl vibes, and I noped out before the crime scene was even found.
I DNFd Storm Front, the first book of the Dresden Files pretty early on twice before actually finishing it. Harry Dresden is pretty intensely unlikable in the first couple of books.