From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
182 Moby Thesaurus words for "unsubstantial": Barmecidal, Barmecide, adulterated, airy, apparent, apparitional, asomatous, astral, attenuate, attenuated, autistic, bodiless, breakable, brittle, cheap-jack, chimeric, cobwebby, crumbling, crumbly, cut, dainty, dangerous, decarnate, decarnated, deceptive, decrepit, delicate, delicately weak, delusional, delusionary, delusive, delusory, dereistic, desultory, dilute, diluted, discarnate, disembodied, disintegrating, dreamlike, dreamy, effeminate, erroneous, ethereal, extramundane, fallacious, false, fanciful, fantastic, feeble, fine, flimsy, fragile, frail, frangible, gaseous, ghostly, gimcrack, gimcracky, gossamery, hazardous, illusional, illusionary, illusive, illusory, imaginary, immaterial, impalpable, imponderable, improbable, inconceivable, inconclusive, incorporate, incorporeal, incredible, infirm, insecure, insubstantial, intangible, jerry, jerry-built, light, lightweight, merely nominal, metaphysical, misleading, namby-pamby, nonmaterial, nonphysical, nonsubstantial, not real, occult, ostensible, otherworldly, papery, pasteboardy, perilous, phantasmagoric, phantasmal, phantom, poor, poorish, precarious, provisional, psychic, puny, rare, rarefied, risky, rotten, rotten at, seeming, self-deceptive, self-deluding, shadowy, shaky, shattery, shifting, shifty, sissified, sleazy, slight, slippery, specious, spectral, spiritual, subtile, subtle, supernatural, supposititious, tacky, temporary, tentative, tenuous, thick, thin, thinned, thinned-out, ticklish, transmundane, treacherous, unactual, unbelievable, uncompact, uncompressed, unconcrete, unconvincing, undependable, unearthly, unembodied, unextended, unfaithworthy, unfirm, unfleshly, unfounded, unphysical, unproved, unreal, unrealistic, unreliable, unrigorous, unsolid, unsound, unstable, unsteadfast, unsteady, unsturdy, unsubstanced, unsure, unsustained, untrustworthy, unworldly, vaporous, visionary, watered, watered-down, weak, weakly, weightless, windy, wispy, womanish
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