insubstantial

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in·sub·stan·tial / ˌinsəbˈstanchəl/ • adj. lacking strength and solidity: the huts are relatively few and insubstantial insubstantial evidence. ∎  not solid or real; imaginary: the flickering light made her face seem insubstantial.DERIVATIVES: in·sub·stan·ti·al·i·ty / -ˌstanchēˈalitē/ n.in·sub·stan·tial·ly adv.