defective

adjective
de·​fec·​tive | \ di-ˈfek-tiv How to pronounce defective (audio) \

Definition of defective

 (Entry 1 of 2)

1a : having a defect or flaw : imperfect in form, structure, or function replaced a defective light switch products manufactured with defective materials defective intestinal absorption a defective gene
b dated, now offensive : having a physical or mental impairment
2 grammar : lacking one or more of the usual forms of inflection (see inflection sense 3) Must is a defective verb.

defective

noun

Definition of defective (Entry 2 of 2)

1 : something that is imperfect in form, structure, or function … if we examine 18 items off the production line, we may be interested in the number of defectives we observe in the sample of size 18.— Lloyd Jaisingh
2 dated, now offensive : a person having a physical or mental impairment

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Other Words from defective

Adjective

defectively adverb
defectiveness noun

Synonyms & Antonyms for defective

Synonyms: Adjective

Antonyms: Adjective

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Examples of defective in a Sentence

Adjective This computer is defective. I want my money back. The disease is caused by a defective gene.
Recent Examples on the Web: Adjective Taking on a new loan is a financial burden for many customers who own the troubled Focus and Fiesta vehicles sold this decade with defective dual-clutch automatic transmissions that are the subject of massive litigation and a federal probe. Phoebe Wall Howard, Freep.com, "He had to drive a defective Ford Focus home in reverse. Now he blames automaker for debt," 26 Dec. 2019 Your liability for defective/undelivered items or fraudulent use of your card is $50, and many credit companies will waive that. cleveland, "9 popular holiday scams to watch out for this year," 23 Dec. 2019 By engineering a virus to carry functioning genes to cells to compensate for defective ones, drug makers have developed several revolutionary treatments for devastating genetic diseases, from a rare neurodegenerative disorder to a form of blindness. Jonathan Saltzman — Boston Globe, STAT, "Ring Therapeutics is developing a new way to deliver gene therapy," 19 Dec. 2019 After two crashes of its 737 MAX airliners, which killed 346 people and were linked to a defective flight-software system, the bestselling model was grounded around the world in March. The Economist, "Boeing going wrong Boeing will halt production of its troubled 737 MAX," 18 Dec. 2019 But their argument is just as defective as the old one, if not more so. Jack Butler, National Review, "Destroying Your Lungs to Own the Libs," 7 Nov. 2019 Cherqui’s treatment genetically modifies a patient’s blood-forming stem cells with a functional copy of the defective gene. San Diego Union-Tribune, "As state funding runs out, California stem cell scientists get $30 million gift," 26 June 2019 Therapies that replace a defective gene with a healthy one are an emerging class of treatment pioneered by companies including Spark. Jonathan D. Rockoff, WSJ, "Roche Nears Deal to Buy Spark Therapeutics for Close to $5 Billion," 23 Feb. 2019 Strimvelis uses a harmless virus to insert a healthy copy of the defective gene into the bone marrow where immune cells are produced. Bloomberg.com, "Bloomberg," 6 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'defective.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of defective

Adjective

14th century, in the meaning defined at sense 1a

Noun

1562, in the meaning defined at sense 1

History and Etymology for defective

Adjective

Middle English defectif, defectyve "lacking, faulty, of poor quality," borrowed from Anglo-French defectif, borrowed from Late Latin dēfectīvus "lacking an inflectional form, imperfect, faulty," from Latin dēfectus, past participle of dēficere "to be lacking, run short, fail" + -īvus -ive — more at deficient

Noun

derivative of defective entry 1

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Time Traveler for defective

Time Traveler

The first known use of defective was in the 14th century

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Statistics for defective

Last Updated

15 Jan 2020

Cite this Entry

“Defective.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/defectively. Accessed 24 January 2020.

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More Definitions for defective

defective

adjective
How to pronounce defective (audio)

English Language Learners Definition of defective

: having a problem or fault that prevents something from working correctly : having a defect or flaw

defective

adjective
de·​fec·​tive | \ di-ˈfek-tiv How to pronounce defective (audio) \

Kids Definition of defective

: having a defect or flaw The car's brakes were defective.

defective

adjective
de·​fec·​tive | \ di-ˈfek-tiv How to pronounce defective (audio) \

Medical Definition of defective

 (Entry 1 of 2)

: falling below the norm in structure or in mental or physical function defective eyesight

Other Words from defective

defectiveness \ -​nəs How to pronounce defectiveness (audio) \ noun

defective

noun

Medical Definition of defective (Entry 2 of 2)

: one that is subnormal physically or mentally

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