# unquestionable

/ənˈkwɛstʃənəbəɫ/ (US) · /ʌnkwˈɛstʃənəbəl/ (UK) · CEFR C1 · Adjective

Source: https://englishreference.com/word/unquestionable
Updated: 2026-10-18

## Definition

so clear or true that nobody can doubt it. You use it when something is certain or someone is clearly honest or skilled.

For teachers: incapable of being doubted or disputed; accepted as certainly true or valid. Typically modifies evidence, authority, skill, or moral qualities.

## Examples

- Her honesty is unquestionable to everyone here.
- The doctor's skill is unquestionable after twenty years of successful operations.
- The archive provides unquestionable proof of the treaty, with signed letters that leave historians no room for doubt.

## Synonyms

undeniable, indisputable

## Antonyms

questionable, debatable

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.