insufficiently.

Below the extent needed to meet a stated condition or purpose.

Use it for

Words that belong together

• insufficiently clear
• insufficiently supported

On the page

The proposal was insufficiently clear about who would bear the additional cost.

The conclusion was insufficiently supported rather than directly disproved.

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: moderately common.