fault ‧ y /ˈfɔːlti $ ˈfɒːlti/ BrE AmE adjective
[ Word Family: adjective : ↑ faultless , ↑ faulty ; verb : ↑ fault ; noun : ↑ fault ; adverb : ↑ faultlessly ]
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 OPP correct :
an idea based on a faulty understanding of biology