faulty
adj. B1 Intermediate US //ˈfɔɫti// UK //fˈɒlti// faulty
adj. not working correctly because of a mistake or a broken part. You use this to describe things like machines or logic that have a problem.
adj. containing a defect, error, or imperfection that prevents proper functioning. Often describes mechanical failure or flawed reasoning.
I returned the faulty toaster to the shop.
The investigation revealed that the fire was caused by faulty electrical wiring in the basement.
The scientist's conclusions were dismissed because they were based on faulty data and a misunderstanding of the original hypothesis.
From fault + -y.
Usage
Commonly used with both physical objects and abstract concepts like logic, memory, or reasoning.