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WordNet-Online 
 
Adjective insubstantial has 2 senses 
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| insubbordination insubordinate insubordinate clause insubordinate clauses insubordination insubrdinate clause insubsequent insubstanial insubstantial insubstantiality insubstantially insufferable insufferably insufferrably insufficiant insufficiency insufficient 
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