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Synonyms
un·sub·stan·tial (ŭńsəb-stăńshəl)

adjective 

  1. Lacking material substance; insubstantial.
  2. Lacking firmness or strength; flimsy.
  3. Lacking basis in fact.

derivatives

uńsub·stańti·aĺi·ty
noun
uńsub·stańtial·ly
adverb