1. Not in good condition;
    Damaged or decayed (synset 302283378)
    "an unsound foundation"
  2. Not sound financially (synset 302282002)
    "unsound banking practices"
  3. Containing or based on a fallacy (synset 302510010)
    "fallacious reasoning"; "an unsound argument"
  4. Suffering from severe mental illness (synset 302083947)
    "of unsound mind"
  5. Physically unsound or diseased (synset 301177766)
    "has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth"
  6. Of e.g. advice (synset 300729148)

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