indubitable.

So well established that there is no reasonable doubt about it.

Use it for

Words that belong together

• indubitable fact
• indubitable evidence

On the page

The damage was indubitable, though its cause remained disputed.

Usage notes

Primary category: analysis / argumentation / evidence. Forms: Normally non-gradable; no ordinary comparative or superlative. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: evaluation, claim. Commonness: uncommon.