defective /dɪˈfɛktɪv/ adjective Learner's definition of DEFECTIVE
[more defective; most defective]
: having a problem or fault that prevents something from working correctly : having a defect or flaw有缺点的；有缺陷的；有毛病的 -
Our car had defective [=faulty] brakes, so we had them replaced.我们的汽车刹车有毛病，所以我们把它们换掉了。
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This computer is defective. I want my money back.这台电脑是残品。我要退货。
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defective products/merchandise有缺陷的产品/商品
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The disease is caused by a defective gene.这种病是由一种有缺陷的基因导致的。