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insubstantiality has no recorded synonym. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is substantiality.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
lack of solid substance and strength
lacking substance or reality
Synonyms, antonyms and the broader and narrower relations for insubstantiality come from Princeton University’s WordNet. Full sources and licences.