Definition from macmillandictionary.com
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Administrators should make sure the programmes are legally sound.
a sound decision
a sound business/company
Firms wishing to take part in the programme must be able to show that they are financially sound.
a sound understanding of basic teaching skills
a sound heart
The jury found that Holman was of sound mind when he committed the murder.
a sound building
Investigators found the plane to be structurally sound.