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English definition of “insubstantial”

insubstantial

adjective uk   /ˌɪn.səbˈstæn.ʃəl/ /-ˈstɑːn-/ us  

insubstantial adjective (NOT ENOUGH)

not enough or not strong enough: an insubstantial meal insubstantial evidence

insubstantial adjective (IMAGINARY)

literary not existing as a physical person or thing: She seemed somehow insubstantial - a shadow of a woman.
(Definition of insubstantial from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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