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"

Derived forms: unsoundnesses

See also: unsound

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

Antonym: soundness

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• midgut
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• midshipman
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