Open any mediocre novel to a random page and find a dialogue scene. Read it aloud. Notice how complete it is , how each exchange begins at the beginning of a thought and arrives, dutifully, at its conclusion. Notice how both characters seem to be listening perfectly, how no one talks over anyone, how misunderstanding is always resolved within the scene. It sounds, in short, like no conversation that has ever actually occurred between two human beings.
Real conversation is fragmentary, recursive, full of abandoned sentences and strategic vagueness. People do not say what they mean. They say what they hope will produce the effect they want, and they are frequently wrong about which words will achieve it. Great dialogue captures this not by transcribing it , transcribed real speech is unreadable , but by understanding the gap between what a character says and what they intend.
The Information Problem
Most overwritten dialogue has the same root cause: the writer is using it to deliver information. Characters explain their backstories to each other. They articulate their feelings with a precision and completeness that no person under actual emotional pressure has ever managed. They say the thing that the reader needs to know because the writer cannot think of another way to convey it.
This is the dialogue equivalent of a character looking in a mirror and describing themselves. It is not that readers fail to receive the information , they do. But they also receive another message, louder and more damaging: that no one in this story exists outside of the writer's need to use them as a vehicle for plot.
"Great dialogue is not the thing characters say. It is the pressure between what they say and what they need, and the reader lives in that gap."
The rule that every writing teacher offers , show, don't tell , applies with particular force to dialogue. If a character is angry, they should not say they are angry. They should say something that only an angry person would say, in the way that only this specific angry person would say it. The emotion is in the selection, not the declaration.
What Silence Does
The most underused element in dialogue is silence. Not the stagey silence of a dramatic pause, but the functional silence of a question that receives a changed subject, a confession that is met with a comment about the weather, an accusation that gets absorbed without reply. Silence in dialogue is not an absence of meaning. It is meaning that has been made too dangerous to speak.
The deflection
Harold Pinter built an entire body of work on the premise that what characters refuse to say is more revealing than what they say. His characters deflect, misremember, change the subject mid-sentence, answer questions with questions. The tension in a Pinter play comes not from what is happening on stage but from the reader's growing understanding of what is being systematically avoided.
The half-sentence
Equally powerful is the sentence that stops before it arrives. Characters who cannot finish their own thoughts , not because they are stupid, but because they are frightened, or conflicted, or reaching for something they do not have the language for , are more believable than characters who speak in complete paragraphs. The em dash is one of the most honest punctuation marks in dialogue. It admits that speech is not always a finished thing.
The test I apply to every dialogue scene I write is simple: could either character say their lines in a different scene, with a different person, about a different subject? If yes, the dialogue is generic. It is performing the function of dialogue , moving the scene forward, conveying information , without being dialogue at all. Real dialogue is irreplaceable. Every line belongs to this character, in this moment, because of everything that has happened between these two people before the scene began.
Cut any line that could belong to someone else. What remains will be enough.