What Makes a Good Query? Measuring the Impact of Human-Confusing Linguistic Features on LLM Performance
Paper · 2026 · William Watson, Nicole Cho, Sumitra Ganesh et al.
Summary
The paper asks whether the phrasing of a query, and not only the model or its decoding, affects how often LLMs hallucinate. Drawing on linguistics, the authors define 17 binary query properties that are known to make text harder for humans to understand. These include lack of specificity, clause complexity, anaphora, negation, polysemy, answerability and intention grounding. An LLM labels these properties with few-shot prompts across 369,837 real-world queries from 13 QA datasets.
Benchmark items may be memorized, so each query is replaced by six filtered paraphrases. Each paraphrased answer is scored with a combined LLM-judge and string-similarity proxy, and the number of failures places the query in one of three classes: Safe, Borderline or Risky. A proportional-odds model with dataset and scenario fixed effects, together with ECDF comparisons, links features to risk.
Vague and syntactically intricate queries are associated with more hallucination. Answerable queries with explicit intent are associated with less. Several features that typically trouble human readers, such as rare words and superlatives, have little association with hallucination. The findings support triaging and rewriting queries before generation, though the evidence is correlational rather than causal.
Key points
- Data and labels:
- The corpus has 369,837 queries from 13 QA datasets, covering 3 scenarios and 16 configurations.
- Paraphrases are kept only if their hybrid similarity is at least 0.85. This similarity combines text-embedding-3-large and the MS-MARCO-MiniLM-L6-v2 cross-encoder.
- The hallucination proxy weights its components 0.6 (LLM judge), 0.3 (fuzzy match) and 0.1 (BLEU-1).
- Labels depend on how many of the six paraphrases fail: Safe means 0/6, Borderline 1–3/6, and Risky 4–6/6.
- Strongest risk factors:
- Lack of Specificity has a coefficient of 0.868 (OR 2.382).
- Clause Complexity has a coefficient of 0.568 (OR 1.764).
- Negation (0.311) and Anaphora (0.214) show weaker positive effects.
- Protective factors:
- Answerability has the largest negative coefficient, −1.106 (OR 0.331).
- Intention Grounding has a coefficient of −0.168.
- Numeric measures (Query Token Length, Number of Clauses, Dependency Depth) are also inversely related to risk.
- Mixed or null effects:
- Domain Specificity is near zero (0.003) and varies by dataset and model.
- Named Entities Present is not significant. The paper reports both p = 0.205 and an adjusted p = 0.115.
- Related Work mentions 22 features, while the method describes 17 binary features plus numeric syntactic measures.
- Practical guidance and limitations:
- The authors suggest routing high-risk queries to a clarification step or to retrieval.
- They also suggest low-effort rewrites: add constraints such as time, place or entity; state intent explicitly; and disambiguate polysemous words. These rewrites matter most for short, open-ended prompts.
- The study covers English only and is observational.
- It relies on an LLM judge and does not model interactions between features.
Fields, topics and concepts
📚 Shelves 5The field of science this work belongs to (OpenAlex fields).Computer Science · 18,614 worksArtificial Intelligence · 17,965 worksArts and Humanities · 17,450 worksLanguage and Linguistics · 17,296 worksInformation Systems · 1,730 works
🧭 Topics 1Research subjects and languages the work is about.Language models & pretraining · 3,894 works
Cite
Cite as William Watson, Nicole Cho, Sumitra Ganesh and Manuela Veloso. 2026. What Makes a Good Query? Measuring the Impact of Human-Confusing Linguistic Features on LLM Performance. Findings of the Association for Computational Linguistics: EACL 2026.
@inproceedings{watson2026what,
title = {{What Makes a Good Query? Measuring the Impact of Human-Confusing Linguistic Features on LLM Performance}},
author = {William Watson, Nicole Cho, Sumitra Ganesh and Manuela Veloso},
booktitle = {Findings of the Association for Computational Linguistics: EACL 2026},
year = {2026},
doi = {10.18653/v1/2026.findings-eacl.251},
url = {https://doi.org/10.18653/v1/2026.findings-eacl.251}
}References
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