in·sub·stan·tial /ˌɪn(t)səbˈstæn(t)ʃəl/
  (a.)脆弱的,無實體的,非實質的
  In·sub·stan·tial a. Unsubstantial; not real or strong. “Insubstantial pageant.” [R.]
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  insubstantial
       adj 1: lacking material form or substance; unreal; "as
              insubstantial as a dream"; "an insubstantial mirage on
              the horizon" [syn: unsubstantial, unreal] [ant: substantial]
       2: lacking in nutritive value; "the jejune diets of the very
          poor" [syn: jejune]