(a.) Lacking in matter or substance; visionary; chimerical.

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