Definition of insubstantial adjective from the Oxford Advanced American Dictionary

     

    insubstantial

     adjective
    adjective
    NAmE//ˌɪnsəbˈstænʃl//
     
     
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  1. 1not very large, strong, or important an insubstantial construction of wood and glue an insubstantial argument an insubstantial meal
  2. 2(literary) not real or solid as insubstantial as a shadow
See the Oxford Advanced Learner's Dictionary entry: insubstantial