AI writing tells: the em dash problem, and the words that give you away

Somewhere in the last year, a punctuation mark went on trial. Scroll any comment section and you will find someone pointing at a long dash and declaring the whole post was written by a robot. The —, the em dash, became the internet's favorite piece of evidence. The problem is that the evidence is circumstantial, and most people are reading the case wrong.

The em dash is a clue, not a verdict

Let us be honest about the em dash, because the honest version is more useful than the witch hunt. On its own, it proves nothing. Careful writers, editors, and novelists have used the em dash for a century. It is a perfectly good mark. Reporters who have looked into the —equals robot theory keep reaching the same conclusion: plenty of human writing is full of them, and some AI models barely use them at all.

So why did it become a tell? Two reasons. First, most people never type a real em dash, because there is no key for it, so they reach for a comma or a plain hyphen. The writing engines do not have that friction, so they emit the long dash constantly. Second, and this is the part that actually matters for you, readers now believe it is a tell. On a feed, perception is the whole game. If your post pattern matches what people have decided AI looks like, you pay the trust tax whether or not you used a machine.

That is the real lesson. The em dash is not a verdict, but it is a clue, and clues travel in packs. One long dash in an otherwise sharp, specific post is nothing. A long dash sitting next to five other tells is a confession.

The tells that actually give AI away

The stronger signals are structural and they cluster. Once you learn to see them, you cannot unsee them. Here are the ones that do the most damage:

• The hype opener."I am thrilled to announce." "Humbled and honored to share." The post leads with a feeling instead of the news. People who are genuinely excited usually just tell you the thing.
• The seesaw."It is not just a tool, it is a movement." The "not just X, it is Y" construction sounds profound and says almost nothing. The engines love it.
• Emoji bullet lists. Every line opening with a rocket, a bulb, or a sparkle. It is the template look of a thousand identical posts.
• The hashtag wall. Six or more hashtags stapled to the bottom. A spam signal that AI tacks on by reflex.
• The metronome. Every sentence the same medium length, so the whole thing reads in one flat tone. Human writing is bursty: short line, then a longer one that winds out a thought, then a snap.
• The rule of three, on repeat."Faster, smarter, and better." "Bigger, bolder, and louder." One triad is rhetoric. Four in a row is a tell.
• Essay glue."Moreover." "Furthermore." "In conclusion." Connectors nobody uses out loud, holding a post together like a school assignment.

Underneath all of them sits the deepest tell of the lot: abstraction where a specific should be. The engines write around a topic. People name the client, the number, the date, the thing that went wrong on Tuesday. Specifics are the fingerprint a machine has the hardest time faking.

The words that sound like AI

There is also a lexicon. None of these words are banned, and you can use any of them in a sentence that sounds completely human. The trouble is density and predictability. When several show up in one short post, the whole thing tips over into machine. The usual suspects:

delve, tapestry, leverage, synergy, game-changer, seamless, robust, elevate, unlock, foster, realm, plethora, myriad, testament to, cutting-edge, best-in-class, navigate, landscape, and the evergreen "in today's fast-paced world."

The fix is not to memorize a banned list. It is to ask, for each one, whether you would actually say it to a colleague over coffee. If the answer is no, it is padding, and padding is what makes writing sound generated.

How to make your writing sound human

Sounding human is mostly subtraction, plus a few specifics. A short checklist that fixes the bulk of it:

• Cut the long dashes. Replace each with a comma or a period. You lose nothing and you drop the most visible flag.
• Open with the point. Delete the announcement of the announcement. Start with the news, the number, or the opinion.
• Trade one abstraction for one detail.Swap "we drove significant impact" for "we cut their onboarding from nine days to two." One real number does more than a paragraph of adjectives.
• Vary the rhythm. Put a three-word sentence next to a twenty-word one. Read it aloud and listen for the metronome.
• Kill the buzzwords. If you would not say it out loud, cut it.

Notice that none of this is about fooling a detector. The so-called AI detectors are unreliable on purpose-built tests, and chasing them is a waste of time. The goal is simpler and older than any of this: sound like a person, because that is what earns a reader's trust.

Check your draft in ten seconds

You do not have to hold all of this in your head. We built a free AI Writing Checker that does the scan for you. Paste a draft and it flags every tell on this page, the em dashes, the buzzword clusters, the hype openers, the emoji bullets, the hashtag walls, the flat rhythm, and gives you a plain human-ness score from 0 to 100 with a fix for each flag. There is a one-click button to clean up the obvious mechanical tells, and you can even paste a public LinkedIn post link to check a post straight from its URL. It runs in your browser, with no signup.

The bottom line

The em dash did not ruin your writing, and removing it will not save it. What reads as AI is the pattern: the canned opener, the seesaw, the triads, the buzzwords, the flat rhythm, and the absence of a single real detail. Fix the pattern and the writing sounds like you again, which is the only thing that was ever going to earn attention. Run your next post through the AI Writing Checker before you publish, and let the score, not a single punctuation mark, be the judge.