Dictionary![]() ![]() un•sub•stan•tialPronunciation: (un"sub-stan'shul), [key] —adj. 1. not substantial; having no foundation in fact; fanciful; insubstantial: an unsubstantial argument; unsubstantial hopes. 2. without material substance: an unsubstantial ghost. 3. lacking material substance; materially paltry: an unsubstantial dinner of bread and cheese. 4. lacking strength or solidity; flimsy: an unsubstantial wall of cardboard. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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