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Noun: unsoundness  ,ún'sawnd-nus
  1. A condition of damage or decay
  2. A misconception that is fallacious and not true or valid
    "the unsoundness of his conclusion was obvious"
  3. Not mentally or physically healthy
    "no one can be a poet without a certain unsoundness of mind"

Type of: bad, badness, condition, misconception, status

Antonym: soundness, wiseness