Defective adjective
1. having a defect or flaw; faulty; imperfect
2. Psychology . characterized by subnormal intelligence or behavior.
3. Grammar . (of an inflected word or its inflection) lacking one or more of the inflected forms proper to most words of the same class in the language, as English must, which occurs only in the present tense.

This is a defective car.

external image img_8682.jpg
These are not defective cars.