Most of the time when I drop a book it's due to gravity and clumsiness (and usually means I need a new Kindle or phone).
Some books I've stopped reading, though would be:
- The Blind Clockmaker - interesting premise but just kind of dense. That and, before I could get to the second section, I had to return it to the library.
- A book by Isaac Asimov about lasers - same as above but denser. Also same library issue as above.
- The Worm Ouroboros by E. R. Eddings - In four tries, made it to chapter seven I think, but then the book suffered water damage and I never made a fifth try. The author's attempt to bring the reader INTO the story as an immaterial observer just fell flat for me, and created a level of separation between me and his MC that I could not breach.
- A book on nuclear war that was part of the suggested reading for a high school project. Had barely made it through the first chapter when I realized it would take more time to read than I had available to write - and that the exact comment I needed for the paper was on the dust jacket and may never actually appear in the book. My teacher and I spent an hour trying to find the right format for that footnote, and I never touched that book again afterwards.
- Had two books that moved into graphic sex scenes in early chapters and just drove me away as well, but I was pretty young when I read that first one and the second was also badly written in general. Might be able to get through either one or both if I could remember the names now but... eh...
- Starship Troopers - tried to read it when I was expecting it to be more like Heinlein's Young Adult stuff and not like his more Adult stuff and just could not get into it.
- Dropped one series (Patterson's "Maximum Ride" series) when it went from wild YA adventure with superpowers to preaching about climate change in book three or four.
There were a few I read a chapter or two on and may eventually go back to, but didn't feel compelled to continue across multiple websites as well.
One of the few I can think of that I actively decided to stop instead of slowly petering off is in Wheel of Time. I found the setting more interesting than the characters already, but then we came to a segment in which a guy is getting sexually harassed by a powerful woman repeatedly and is clearly distressed about it. 95% of the cast, including most of the narration, treats it as a joke.
Exactly one character I can remember called that out as pretty fucked up, and thankfully the response wasn’t further justification, but by that point I had such an overwhelming level of ick that I had no interest in picking up the next book. (Yes I finished the book itself, but this is the closest example I could think of)
Ah forgot that series - yeah I dropped it because I hit a point where I'd have to go back and reread the first six to make sense of it and, as much as I loved the first two, it got to be a slog around four (and went on, to, what 14, with three written entirely by Sanderson, one about half and half Jordan and Sanderson, and one based on notes and extensive conversations between the two prior to Jordan's death, but without him actually writing anything).
Also dropped
Thieves' World because I'd just picked up book five when book 9 came out and I just couldn't keep up... And there are a few series that continued after I stopped paying attention to them so I didn't exactly DROP them, just didn't bother to keep up...
And a few that I've never actually found every book for, even though they were four or more books long (Lawheed's Arthur series - owned the first two, read three from a library, never bothered continuing it; Courtway Jones Arthurian series - only ever found book TWO anywhere)
The Destroyer novel series - read about forty of them. About ten books after one of the two creators left the series, it started to fall apart, and then became a house organ, with new writers assigned and the one remaining creator acting as editor, when he could be bothered, but keeping his name on it; around book 100 Remo and Chiun seem to reverse personalities and it's just not as much fun.