unsoundness

Noun
  1. A condition of damage or decay (synset 114583952)
  2. A misconception that is fallacious and not true or valid (synset 105949406)
    "the unsoundness of his conclusion was obvious"
  3. Not mentally or physically healthy (synset 105167556)
    "no one can be a poet without a certain unsoundness of mind"

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