We had endless discussions about characters and plots.
Meaning: This means that we spent a lot of time talking about the books we were reading and the characters and events in those books.
Choice of Words: Endless means without end or limit. Discussions are talks or conversations about a particular subject. Characters are the people or animals in a story. Plots are the main stories or events in a book. When you put them together, "We had endless discussions about characters and plots" means that we talked a lot about the people and events in the books we were reading.
Alternative Expressions
Related Expressions