Longman Dictionary of Contemporary English homepage

faulty

 adjective
     
fault‧y
1 not working properly, or not made correctly:
Customers may ask for a refund if the goods are faulty.
a faulty gene that causes breast cancer
2 a faulty way of thinking about something contains a mistake, so that you make a wrong decision:
an idea based on a faulty understanding of biology
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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