Definitions

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

  • adj. Not dependably strong or solid.
  • adj. Not physically or mentally healthy.
  • adj. Not true or logically valid; fallacious: an unsound conclusion.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not sound; not whole; not solid; defective; infirm; diseased.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not sound; not whole; not solid; defective; infirm; diseased.

from The Century Dictionary and Cyclopedia

  • Not sound.

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

  • adj. not sound financially
  • adj. containing or based on a fallacy
  • adj. not in good condition; damaged or decayed
  • adj. suffering from severe mental illness
  • adj. physically unsound or diseased
  • adj. of e.g. advice

Etymologies

un- +‎ sound. (Wiktionary)

Examples

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