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unsound 
1  adj If a conclusion or method is unsound, it is based on ideas that are wrong. 
usu v-link ADJ  (Antonym: sound)  The thinking is good-hearted, but muddled and fundamentally unsound..., The national tests were educationally unsound.  
2  adj If something or someone is unsound, they are unreliable.  (=unreliable) 
No sensible person would put his money in a bank he knew to be unsound.  
3  adj If you say that something is unsound in some way, you mean that it is damaging in that way or to the thing mentioned. 
usu v-link ADJ, usu adv ADJ  (Antonym: sound)  The project is environmentally unsound..., A diet extremely low in calories can also be a diet that is nutritionally unsound.  
4  adj If a building or other structure is unsound, it is in poor condition and is likely to collapse. 
usu v-link ADJ 
The church was structurally unsound.  



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