Origin: Latin suffix -al
Insubstantial has 4 different meanings across 1 category:
lacking material form or substance; unreal
"as insubstantial as a dream"
"an insubstantial mirage on the horizon"
lacking solidity or strength
"a flimsy table"
"flimsy construction"
"vinyl siding has become the standard-bearer for cheap, insubstantial construction"
Lacking substance; not real or strong.