AI detectors like Turnitin, GPTZero, and Originality.ai are trained to recognise words and phrases that appear in AI-generated text far more often than in human writing. This free reference lists all 51 of them — with the reason each one flags, a human alternative, and severity rating. Use Ctrl+F to find them in your text, or use the free AI Humanizer to remove them automatically.
51
Total words & phrases
20
High-severity
5
Categories
3
Detectors covered
Removing these words alone is not always enough
AI detectors also measure perplexity (how predictable each word choice is) and burstiness (sentence length variation). For a 60–80 point score reduction, use the free AI Humanizer which addresses all three signals simultaneously. In our test: 86% → 12% (−74 pts) in 15 seconds.
Showing 51 of 51 entries
| Word / Phrase | Category | Why It Flags AI Detectors | Human Alternative | Severity | |
|---|---|---|---|---|---|
| delve | Filler Verbs | ChatGPT uses it 50× more than humans; extremely rare in natural writing | explore, examine, look into | High | |
| leverage | Filler Verbs | Corporate jargon overused by LLMs in every context | use, apply, draw on | High | |
| facilitate | Filler Verbs | Bureaucratic filler that adds length without meaning | help, enable, allow | High | |
| underscore | Filler Verbs | Journalistic cliché used excessively by AI | highlight, show, confirm | High | |
| streamline | Filler Verbs | Process-improvement cliché; rarely used by human writers | simplify, speed up, improve | Medium | |
| foster | Filler Verbs | AI uses it as a generic 'encourage/develop' substitute | build, grow, develop, encourage | Medium | |
| harness | Filler Verbs | Overused in AI writing about technology and resources | use, tap into, apply | Medium | |
| navigate | Filler Verbs | AI uses it metaphorically in almost every context | handle, manage, work through | Medium | |
| embark | Filler Verbs | Dramatic verb AI uses for ordinary actions | start, begin, take on | Medium | |
| unveil | Filler Verbs | AI uses it as a generic 'reveal/show' substitute | reveal, show, present, introduce | Medium | |
| elevate | Filler Verbs | AI uses it as a generic 'improve' substitute | improve, raise, boost | Medium | |
| cultivate | Filler Verbs | Agricultural metaphor AI applies to abstract concepts | build, develop, grow | Medium | |
| crucial | Adjectives | ChatGPT marks nearly everything as crucial | important, key, central, essential | High | |
| comprehensive | Adjectives | Used in almost every AI overview or summary | full, complete, thorough, detailed | High | |
| multifaceted | Adjectives | Academic-sounding filler that rarely adds meaning | complex, varied, layered, diverse | High | |
| nuanced | Adjectives | Overused hedge word that signals AI-generated text | subtle, detailed, careful, specific | High | |
| paramount | Adjectives | Formal synonym for 'most important' overused by AI | most important, essential, top priority | High | |
| robust | Adjectives | Tech/business jargon applied to everything by AI | strong, reliable, solid, effective | High | |
| pivotal | Adjectives | Overused importance marker in AI writing | key, critical, defining, decisive | High | |
| invaluable | Adjectives | AI uses it as a generic 'very useful' substitute | very useful, essential, highly valuable | Medium | |
| intricate | Adjectives | AI applies it to anything moderately complex | complex, detailed, elaborate | Medium | |
| vibrant | Adjectives | AI uses it as a generic positive descriptor | lively, active, energetic, thriving | Medium | |
| dynamic | Adjectives | Overused as a generic positive adjective by AI | active, changing, flexible, responsive | Medium | |
| innovative | Adjectives | AI applies it to almost any new idea or approach | new, creative, original, novel | Medium | |
| it is worth noting | Transition Phrases | Filler transition phrase that adds no meaning | Notably, / Note that / Worth noting: | High | |
| in conclusion | Transition Phrases | Formulaic AI closing phrase that flags immediately | Overall, / To summarise, / Ultimately, | High | |
| it is important to note | Transition Phrases | Padding phrase used in nearly every AI paragraph | Importantly, / Note that / Crucially, | High | |
| this highlights the importance of | Transition Phrases | Circular filler that restates the obvious | This shows why / This confirms / This explains | High | |
| in today's world | Transition Phrases | Generic scene-setting opener AI uses constantly | Start with a specific fact or statistic instead | High | |
| furthermore | Transition Phrases | Formal connector overused by AI; sounds unnatural | Also, / And, / On top of that, | Medium | |
| moreover | Transition Phrases | Another formal connector AI overuses | Also, / In addition, / Beyond that, | Medium | |
| in addition | Transition Phrases | Predictable connector that AI uses in every paragraph | Also, / And, / Plus, | Medium | |
| it is essential to | Transition Phrases | Instruction-giving phrase AI uses excessively | You should / It helps to / Make sure to | Medium | |
| one must consider | Transition Phrases | Formal academic phrasing AI defaults to | Consider / Think about / Keep in mind | Medium | |
| significantly | Adverbs | AI uses it to intensify any claim without specifics | Replace with a specific number or percentage | High | |
| essentially | Adverbs | Vague intensifier AI uses as a hedge | basically, in effect, in practice | Medium | |
| ultimately | Adverbs | AI uses it to signal conclusions in every paragraph | In the end, / Finally, / At its core, | Medium | |
| notably | Adverbs | AI uses it as a generic emphasis marker | In particular, / Specifically, / For example, | Medium | |
| particularly | Adverbs | Overused qualifier in AI writing | especially, specifically, in particular | Medium | |
| undoubtedly | Adverbs | AI uses it to assert certainty without evidence | Clearly, / Without question, / The data shows | Medium | |
| inherently | Adverbs | AI uses it to make claims sound more authoritative | by nature, naturally, in itself | Medium | |
| in summary | Structural Patterns | Formulaic AI closing that flags immediately | Write a specific takeaway sentence instead | High | |
| to summarize | Structural Patterns | Another formulaic AI closing phrase | Write a specific takeaway sentence instead | High | |
| as mentioned earlier | Structural Patterns | AI uses it to create artificial cohesion | Delete it — just make the reference directly | Medium | |
| it goes without saying | Structural Patterns | Filler phrase that weakens arguments | Delete it — just state the point directly | Medium | |
| needless to say | Structural Patterns | Contradictory filler AI uses frequently | Delete it — just state the point directly | Medium | |
| in the realm of | Structural Patterns | Vague scene-setting phrase AI uses constantly | In [specific field], / Among [specific group], | Medium | |
| a testament to | Structural Patterns | Dramatic phrasing AI uses for ordinary observations | evidence of, proof of, a sign of | Medium | |
| stands as | Structural Patterns | AI uses it as a dramatic substitute for 'is' | is, serves as, acts as | Medium | |
| plays a crucial role | Structural Patterns | Combines two AI markers (plays + crucial) | is important for, drives, shapes, affects | High | |
| in the context of | Structural Patterns | Vague framing phrase AI uses in every paragraph | In [specific context], / When [specific condition], | Medium |
Press Ctrl+F in your word processor, search for each high-severity word, and replace it with the human alternative. Focus on the 17 high-severity entries first — they have the largest impact on AI detection scores.
Paste your text into the free AI Humanizer, select Academic mode at Maximum strength, and click Humanize. It removes all AI signature words, restructures sentences, and varies length — reducing scores by 60–80 pts in 15 seconds.
Add this to your prompt: "Avoid these words: delve, leverage, crucial, comprehensive, multifaceted, nuanced, paramount, robust, streamline, facilitate, underscore, pivotal. Do not start the conclusion with In conclusion or In summary." This reduces the initial AI score by 20–30 pts.
AI signature words are words and phrases that appear in ChatGPT and other AI-generated text far more frequently than in human writing. AI detectors like Turnitin, GPTZero, and Originality.ai are trained to recognise these patterns. The single strongest signal is the word "delve" — ChatGPT uses it approximately 50 times more often than human writers.
"Delve" is the single strongest AI signal, used ~50× more by ChatGPT than humans. Other high-severity words include: leverage, crucial, comprehensive, multifaceted, nuanced, paramount, robust, pivotal, and the transition phrases "it is worth noting", "in conclusion", "this highlights the importance of", and "plays a crucial role".
Removing AI signature words reduces scores by 15–25 points but is usually not sufficient alone. AI detectors also measure perplexity (how predictable each word choice is) and burstiness (sentence length variation). For the best results, combine word removal with an AI humanizer, which addresses all three signals simultaneously. In our test, this combination reduced a Turnitin score from 86% to 12%.
This list is updated as new AI models are released and as detector training data evolves. The current version covers ChatGPT-4o, Claude 3.5, and Gemini 1.5 output patterns as of May 2026. New AI signature words are identified by comparing large corpora of AI-generated text against human-written academic text.
Yes. This reference is published under CC BY 4.0 — you are free to share and adapt it for any purpose, including commercial use, as long as you credit FreeAcademicTools.com.
Instead of replacing words one by one, paste your text into the free AI Humanizer. It removes all AI signature words, restructures sentences, and varies length — reducing AI detection scores by 60–80 pts in 15 seconds.
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