faulty

adjective

Definitions of faulty

defective or imperfect, often when referring to a broken part or problem with a machine

New consumer laws give customers a better chance of a redress if they are sold faulty goods.

(of eg a legal document) not properly written (eg missing something that is legally required for it to be valid)

The security agreement between the bank and the debtor was faulty because it lacked the proper signatures.