Webster's English Dictionary

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insubstantial

in.sub.stan.tial \.in(t)-s*b-'stan-ch*l\ \-.stan-che--'al-*t-e-\ aj [prob. 
   fr. F insubstantiel, fr. LL insubstantialis, fr. L in-] + LL substantialis 
   substantial 1: lacking substance or reality : IMAGINARY  2: lacking 
   firmness or solidity  - in.sub.stan.ti.al.i.ty n