having a defect or flaw; faulty; imperfect: a defective machine.
Psychology. characterized by subnormal intelligence or behavior.
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.
a defective person or thing.

1375–1425; < Late Latin dēfectīvus, equivalent to dēfectus (see defect) + -īvus -ive; replacing Middle English defectif < Middle French < Late Latin, as above

defectively, adverb
defectiveness, noun
nondefective, adjective
nondefectively, adverb
nondefectiveness, noun
predefective, adjective
undefective, adjective
undefectively, adverb
undefectiveness, noun

1. incomplete, deficient.

1. perfect, complete. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
defective (dɪˈfɛktɪv)
1.  having a defect or flaw; imperfect; faulty
2.  (of a person) below the usual standard or level, esp in intelligence
3.  grammar (of a word) lacking the full range of inflections characteristic of its form class, as for example must, which has no past tense

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 15c., from Fr. défectif (14c.), from L. defectivus, from defect-, pp. stem of deficere (see deficient). A euphemism for "mentally ill" from 1898 to c.1935.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

defective de·fec·tive (dĭ-fěk'tĭv)

  1. Having an imperfection or malformation.

  2. Lacking or deficient in some physical or mental function.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Sure, the product's quality is graded, but nothing is done about defective
  understanding as the student is pushed down the line.
Personalized items cannot be returned unless damaged or defective.
The defective tube could then be retrofitted back at the plant.
The company voluntarily withdrew all bottles with defective gas.
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