defective

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defective

 [de-fek´tiv]
1. imperfect.
2. a person lacking in some physical, mental, or moral quality.

de·fec·tive

(dĕ-fek'tiv), Negative or pejorative connotations of this word may render it offensive in some contexts.
Denoting or exhibiting a defect; imperfect; a failure of quality.

defective

[difek′tiv]
Etymology: L, defectus, a failing
pertaining to something that is imperfect, or, as in an outdated term, to an individual who may be suffering from any disorder.

de·fec·tive

(dĕ-fek'tiv)
Denoting or exhibiting a defect; imperfect; a failure of quality.

de·fec·tive

(dĕ-fek'tiv)
Denoting or exhibiting a defect; imperfect; a failure of quality.

Patient discussion about defective

Q. Is it a birth defect in children? I know about the causes of autism. Is it a birth defect in children?

A. it's not an easy answer i'm afraid...there are congenital differences, but no "birth defect" that we can detect. there's a good pdf file that gives a full explanation about it...i think you'll find it useful:
http://209.85.129.132/search?q=cache:U7PHTfTAZhYJ:www.nichd.nih.gov/publications/pubs/upload/autism_overview_2005.pdf+http://www.nichd.nih.gov/publications/pubs/upload/autism_overview_2005.pdf&hl=iw&ct=clnk&cd=1&gl=il

Q. why does ADHD make kind of an hype to children? is it a nerve defect?

A. it's a complex interaction among genetic and environmental factors causing a disorder in the central nervous system. a study showed a delay in development of certain brain structures n the frontal cortex and temporal lobe, which are believed to be responsible for the ability to control and focus thinking.

More discussions about defective
References in classic literature ?
Owing to the defective construction of the Rangoon, however, unusual precautions became necessary in unfavourable weather; but the loss of time which resulted from this cause, while it nearly drove Passepartout out of his senses, did not seem to affect his master in the least.
Now the general is the bulwark of the State; if the bulwark is complete at all points; the State will be strong; if the bulwark is defective, the State will be weak.
In point of composition," said Mary, "the letter does not seem defective.
There were many things to admire in Eudosia--a defective education being the great evil with which she had to contend.
The mirror is doubtless defective, the outlines will sometimes be disturbed, the reflection faint or confused; but I feel as much bound to tell you as precisely as I can what that reflection is, as if I were in the witness-box, narrating my experience on oath.