defective◼◼◼(having one or more defects) adjective [UK: dɪ.ˈfek.tɪv] [US: də.ˈfek.tɪv]The clock is defective. = L'horloge est défectueuse.
faulty [faultier, faultiest]◼◼◼(having or displaying faults; not perfect; not adequate or acceptable) adjective [UK: ˈfɔːl.ti] [US: ˈfɒl.ti]It was determined that faulty wiring was the cause of the fire. = Il fut déterminé que du câblage défectueux se trouvait à l'origine de l'incendie.
bad [worse, worst]◼◼◻(faulty; not functional) adjective [UK: bæd] [US: ˈbæd]