Synonyms of unsubstantial

1 Syllable

paled, wrong, limp, frail, thin, weak, shrimp, less

2 Syllables

moony, unreal, flimsier, doughier, doughy, floating, palest, shrimper, wronging, wronger, fluffed, wrongest, sleazier, frailer, limper, flimsy, weakly, umbral, punier, puny, unsound, paler, dreamy, weakest, frailest, weightless, reachy, half-pint, junky, sleazy, weaker, dreamier, infirm

3 Syllables

bodiless, jesuitic, unfleshly, unbacked, dreamed-up, jerrybuilt, notional, light-footed, floatable, unbodied, fragile, shadowy, futile, jerry-built, ungrounded, resultless, featherweight, lightfooted, anile, storybook, ethereal

4 Syllables

implausible, suprahuman, nonmaterial, nonphysical, unphysical, intangible, incredible, gossamery, discarnate, uncorporal, jerry-rigged, misfigured, spiritlike, improbable, illogical, unapparent, unsinkable, nonexistent, insubstantial

5 Syllables

insignificant, supermundane, supranatural, supramundane, metaphysical, discorporate, insupposable, hundred-to-one, inconceivable, unbelievable, unconceivable, nonsubmersible, imaginary, introvertive

6 Syllables

phantasmagorical