Paste an essay, article, or draft to highlight the exact lexical clichés (delve, tapestry, testament, underscore), participial tail clauses, formulaic contrasts, and uniform sentence lengths that make prose sound like ChatGPT.
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Human editors and statistical AI detectors (Turnitin, GPTZero, Pangram) look for two things: predictable word choice (low perplexity) and uniform sentence length (low burstiness). Here are the five patterns that give unedited LLM text away:
| AI Tell Category | What It Looks Like on the Page | How to Fix It |
|---|---|---|
| 1. Overused LLM Vocabulary | delve, tapestry, testament, underscore, pivotal, realm, beacon, meticulous, vibrant, embark | Swap for plain, concrete Anglo-Saxon verbs and nouns (dig into, mix, proof, show, key, area). |
| 2. Participial Tail Clauses | ', highlighting the need for...', ', underscoring the importance of...', ', fostering a sense of...' | Delete the trailing -ing clause after the comma, or turn it into a separate active sentence with a real subject. |
| 3. Formulaic Contrast Framing | 'It's not just X, it's Y' or 'Not only does X..., but it also...' | State what the thing actually does without the rhetorical wind-up. |
| 4. Throat-Clearing Openers & Summaries | 'In today's fast-paced world...', 'It is important to note that...', 'In conclusion...' | Cut the first sentence of the paragraph and start with your specific fact, date, or claim. |
| 5. Monotone Sentence Length (Low Burstiness) | Every sentence sits between 16 and 22 words with identical subject-verb-object cadence. | Write a 5-word sentence. Follow it with a 28-word sentence that unpacks a specific example. |
As our AI detector accuracy evidence page documents, independent benchmarks by Stanford and the Authors Guild show that statistical detectors frequently flag clean, formal human writing and essays by non-native English speakers.
If you write for university courses, literary prizes, or freelance clients, do not rely on a detector score alone. Strip out mechanical clichés using the tool above, check your passive voice and sentence length, and keep keystroke provenance turned on with Google Docs version history or Grammarly Authorship (reviewed in our 2026 Grammarly review).
The strongest tells of unedited ChatGPT, Claude, or Gemini prose are structural rather than single words: participial tail clauses tacked onto the end of sentences (', underscoring the importance of...'), formulaic contrast pairs ('It is not just X; it is Y'), uniform 18-word sentence lengths (low burstiness), and overused words like 'delve', 'tapestry', 'testament', 'pivotal', and 'meticulous'.
No. Professional editors and journalists used em dashes and formal transitions long before LLMs existed, which is why AI detectors frequently misclassify polished human writing. A single word is never proof of AI; editors look for clusters of lexical clichés combined with flat, generic examples.
Accepting Grammarly's red-underline spelling and punctuation fixes does not make your writing sound like AI. However, using one-click generative AI prompts to rewrite whole paragraphs flattens your sentence rhythm and can trigger Turnitin or GPTZero. Enable Grammarly Authorship in Google Docs or Word to keep a verifiable keystroke log.
First, run your draft through the checker above and cut every flagged stock phrase and participial tail. Second, replace abstract summaries with named examples, dates, and numbers from your own experience. Third, vary your sentence length so short, direct sentences break up longer explanations.
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