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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

  1. Not substantial; not solid: as, unsubstantial air. Not real; not having substance; imaginary; illusive: as, unsubstantial forms. Not having good substance; not strong or stout: as, an unsubstantial building; unsubstantial cloth.
  2. Not giving substance or strength; weak; not strengthening or invigorating.

Wiktionary

  1. adj. Archaic form of Xyzy}}.

GNU Webster's 1913

  1. adj. Lacking in matter or substance; visionary; chimerical.

WordNet 3.0

  1. adj. lacking material form or substance; unreal.

Examples

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‘unsubstantial’ has been looked up 1458 times, added to 1 list, commented on 1 time, and has a Scrabble score of 15.