Definition of insubstantial:
ethereal, hypothetical, petty, formless, immaterial, pretended, minuscule, little, poor, feeble, body, puerile, midget, disembodied, fictitious, discreet, infirm, sleazy, small, decrepit, filmy, unwholesome, artificial, nonphysical, frail, frail, aerial, unreal, unsubstantial, minute, false, wraithlike, simulated, gauzy, fake, frothy, fragile, tenuous, tenuous, synthetic, weak, weakly, strong, discarnate, bodiless, delicate, aeriform, uncorporal, airy, slight, mock, insipid, juvenile, flimsy, microscopic, weak, incorporeal, puny, cobwebby, unsound, unbodied, aery, made-up, adolescent, gossamer, jejune, spiritual, tiny, shadowy, flimsy, diminutive, metaphysical, gossamery, nonmaterial.
- "Mark Twain, A Biography, Vol. 1, Part 1, 1835-1866 The Personal And Literary Life Of Samuel Langhorne Clemens", Albert Bigelow Paine.
Afterwards comes the masque, and the marvellous speech of Prospero, which touches the highest height of poetry: These our actors, As I foretold you, were all spirits, and Are melted into air, into thin air: And, like the baseless fabric of this vision The cloud- capped towers, the gorgeous palaces, The solemn temples, the great globe itself, Yea, all which it inhabit, shall dissolve And, like this insubstantial pageant faded, Leave not a rack behind.- "The Man Shakespeare", Frank Harris.
Placed as were these little citadels upon a slender, and- at brief distance- invisible thread of land, with the dark waters rolling around them far and near, they presented an insubstantial dream- like aspect, seeming rather like castles floating between air and ocean than actual fortifications- a deceptive mirage rather than reality.- "Project Gutenberg History of The Netherlands, 1555-1623, Complete", John Lothrop Motley.