insubstantial

adj.

[1]	unsubstantial , unsubstantial , unreal , insignificant , meagre , diaphanous , small , flimsy , frail , weak , feeble , paltry , puny , slight , thin , tenuous , fragile , light , gossamer , wispy , wisp-like , fine
[2]	illusory , jejune , unreal , illusive , imaginary , imagined , fanciful , fancied , visionary , immaterial , intangible , impalpable , incorporeal , airy , ethereal , spiritual , chimerical , phantom , phantasmal , phantasmagorical , hallucinatory , fantastic , false