Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Lacking material substance; insubstantial.
  • adj. Lacking firmness or strength; flimsy.
  • adj. Lacking basis in fact.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Alternative form of insubstantial.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • 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.
  • Not giving substance or strength; weak; not strengthening or invigorating.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lacking material form or substance; unreal

Etymologies

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