inconceivably.

To a degree or in a way that exceeds ready conception or belief.

Use it for

Words that belong together

• inconceivably large
• inconceivably complex

On the page

The system seemed inconceivably complex until its parts were separated.

The narrator described an inconceivably large difference without supplying a numerical comparison.

Usage notes

Primary category: literary / elevated general. 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: narrative transformation, conception and possibility, memory representation, anticipatory detail. Disciplines: literary writing, advanced general English, narrative analysis. Commonness: uncommon.