Meaning : Not in good condition. Damaged or decayed.
Example :
An unsound foundation.
In good condition. Free from defect or damage or decay.
A sound timber.Meaning : Not sound financially.
Example :
Unsound banking practices.
Meaning : Containing or based on a fallacy.
Example :
Fallacious reasoning.
An unsound argument.
Synonyms : fallacious
Meaning : Suffering from severe mental illness.
Example :
Of unsound mind.
Synonyms : mentally ill, unstable
Meaning : Of e.g. advice.