/ Thesaurus / I Synonyms of insubstantiality Find synonyms for: Noun1. insubstantiality, weaknessusage: lack of solid substance and strength2. insubstantiality, immateriality, incorporealityusage: lacking substance or realityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language