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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Lacking substance or reality. See Synonyms at immaterial.
  2. adj. Not firm or solid; flimsy.
  3. adj. Delicate; fine.
  4. adj. Negligible in size or amount.

Century Dictionary and Cyclopedia

  1. Unsubstantial.

Wiktionary

  1. adj. Lacking substance; not real or strong.

GNU Webster's 1913

  1. adj. Unsubstantial; not real or strong.

WordNet 3.0

  1. adj. lacking material form or substance; unreal.
  2. adj. lacking in nutritive value

Examples

Lists

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‘insubstantial’ has been looked up 1068 times, added to 3 lists, and has a Scrabble score of 15.