adj.

1. 1. Having a defect; faulty: a defective appliance.
   2. Marked by subnormal structure, function, intelligence, or behavior: defective speech.
2. Grammar. Lacking one or more of the inflected forms normal for a particular category of word, as the verb may in English.

n. Offensive.

One who is physically or mentally deficient.

defectively de·fec'tive·ly adv.
defectiveness de·fec'tive·ness n.

1. Incomplete, faulty.

2. Not reasonably safe for a use that can be reasonably anticipated. See also Product Liability; Warranty.

adjective

1. Having a defect or defects: faulty, imperfect. See better/worse.
2. Lacking an essential element: deficient, incomplete, lacking, wanting. See better/worse, excess/insufficiency/enough.

adj

Definition: broken, not working
Antonyms: excellent, faultless, flawless, perfect, unbroken

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Something that is wanting as to an essential; incomplete, deficient, faulty, 331 S.W. 2d 140, 143; also, not reasonably safe for a use which can be reasonably anticipated or for which reason it was purchased. 148 A. 2d 261, 265. See warranty [warranty of fitness, warranty of merchantibility]. See also products liability; strict liability.

IN BRIEF: adj. - Not working properly; Markedly subnormal in structure or function or intelligence or behavior; Having a defect.

You should return a defective product.