insubstantial.

1. Lacking much physical substance or solidity.

2. Lacking enough evidence, importance, or value to carry much weight.

Use it for

Words that belong together

• insubstantial material
• insubstantial structure

On the page

The shelter looked insubstantial against the exposed hillside.

Usage notes

Primary category: literary / elevated general. Forms: Comparative more insubstantial; superlative most insubstantial when comparison is meaningful. 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. Commonness: moderately common.