Lacking material form or substance; unreal:
— As insubstantial as a dream.
— An insubstantial mirage on the horizon.
Lacking in nutritive value.
Lacking solidity or strength:
— Vinyl siding has become the standard-bearer for cheap, insubstantial construction.
Moby thesaurus: adulterated, airy, asomatous, astral, attenuate, attenuated, bodiless, boyish, brittle, capricious, changeable, chimerical, corruptible, cut, dangerous, decarnate, decarnated, deciduous, decrepit, defalcation ... show more.
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