Containing a fault or defect; imperfect or defective.
Deserving of blame; guilty.
Having a fault or faults; defective, blemished, imperfect, or erroneous.
The definition of faulty is something unreliable or that doesn't work, or an incorrect thought pattern.
A toaster that doesn't toast bread is an example of a faulty toaster.
When you add 2+2 and get 5, this is an example of faulty reasoning.
When someone is a weak and not very nice person, this is an example of faulty character.
Origin of faulty
fault + -y