indubitably.

Without reasonable grounds for doubt on the relevant point.

Use it for

Words that belong together

• indubitably establish
• indubitably true

On the page

The dated record indubitably established that the order came first.

The calculation was indubitably true within the specified system.

Usage notes

Primary category: academic / formal. Forms: Invariable adverb; use more or most only where natural. 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: scope qualification, degree qualification, criteria application, comparison. Disciplines: academic writing, analytical explanation, research interpretation. Commonness: uncommon.