How to stop AI from flattening your writing voice

Executive overview

AI cleanup tools reliably strip the quirks that make writing sound human. The result is technically correct prose that readers instinctively distrust or skim.

The fix is a set of specific prompt instructions that counteract AI's default tendencies: uniform sentence length, stiff transitions, overused structural patterns, and a narrow vocabulary borrowed from formal writing guides.

Your voice survives AI editing only if you explicitly tell AI what not to do.

Prompt instructions that preserve human writing

• Tell AI: "don't make the output more complicated than the original"
• Specify: "mix sentence lengths — short ones for punch, longer ones for detail"
• Use plain language: "ninth-grade reading level, avoid jargon and buzzwords"
• Allow informal sentence openers: "it's fine to start with and, but, or so — sparingly"
• Ban stiff transitions: exclude words like additionally and moreover
• Ban corrective antithesis (the "it's not X, it's Y" construction) — name it explicitly and give an example in the prompt
• Don't lean on the rule of three — allow one, two, or five items where it fits the point

Banning M dashes

• AI overuses M dashes because it was trained on books where they're common
• Simply saying "don't use M dashes" has low success
• More effective: write "don't use EM dashes" and paste an actual M dash (—) in brackets so AI knows exactly what to avoid
• Alternative: redirect to commas, full stops, or shorter sentences instead
• Or permit short dashes only — paste the short dash as a visual example

Overused AI words and phrases to ban

• Empty opener phrases: "in today's fast-paced world", "in an ever-changing landscape", "when it comes to", "picture this"
• Fake profound hooks: "here's the truth", "here's the thing", "here's the uncomfortable truth", "it's not X, it's Y"
• Hollow adjectives: quietly, ultimately, seamlessly, synergistic, delve
• Build a personal ban list — add any word AI uses that you would never use yourself
• If a word grates on you, it doesn't sound like you: remove it

Building your own anti-AI prompt

• Compile 7–8 dot-point instructions covering the patterns above
• Drop them into any prompt where you ask AI to clean up your writing
• Customise with personal pet hates — generic lists miss words that clash with your specific voice
• Run all outgoing content through the prompt before publishing
• If you spot three or more AI signals in a piece, rewrite rather than patch