Adjective: insubstantial ,in-sub'stan-shul
- Lacking solid basis, importance, or significance
"his insubstantial arguments failed to convince anyone";
- unsubstantial
- Lacking material form or substance; unreal
"an insubstantial mirage on the horizon"; "as insubstantial as a dream";
- unsubstantial, unreal
- Lacking in nutritive value
"an insubstantial and unsatisfying meal"
- Lacking solidity or strength
"vinyl siding has become the standard-bearer for cheap, insubstantial construction";
- flimsy
See also: aerial, aeriform, aery, airy, ethereal, etherial, hollow, immaterial, nonmaterial, shadowy, solidness, stringy, substantiality, substantialness, unwholesome, weak, wraithlike
Antonym: material