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faulty 
1  adj A faulty piece of equipment has something wrong with it and is not working properly. 
The money will be used to repair faulty equipment.  
2  adj If you describe someone's argument or reasoning as faulty, you mean that it is wrong or contains mistakes, usually because they have not been thinking in a logical way.  (=flawed) 
Their interpretation was faulty<endash>they had misinterpreted things.