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.
Their interpretation was faulty<endash>they had misinterpreted things.
Translation English - Cobuild Collins Dictionary
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"