Word family noun substance substantiation substantive adjective substantial ≠ insubstantial substantive verb substantiate adverb substantially
From Longman Dictionary of Contemporary Englishinsubstantialin‧sub‧stan‧tial /ˌɪnsəbˈstænʃəl◂/ adjective 1 formalBREAK not solid, large, strong, or definite The evidence seemed very insubstantial. an insubstantial meal the insubstantial outline of a ship2 literaryAL not existing as a real object or person insubstantial ghostsExamples from the Corpus
insubstantial• Epstein called the evidence insubstantial. 