defective or deficient?
Defective is normally used in reference to processes, machines, or to other functional things such as the human senses: If the workmanship is defective, they'll replace the shoes with a new pair.Artillery officers sometimes have defective hearing.Deficient is used to describe things that lack a quality, element, or ingredient, without this amounting to actual failure to work or function: Her voice is beautiful but a little deficient in power.Their diet is deficient in vitamin D.
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