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defective  –  deficient:

[different pronunciation]

“Defective” means ‘having a fault or defect (something wrong or broken); faulty; not working properly’,

defective teeth & healthy tooth

e.g.

defective printer (machine)

You can get a refund on any defective item (thing) you buy in this supermarket.

He is suffering from defective hearing.

__________

“Deficient” means ‘lacking; not having anything or not having enough of something’,

nitrogen deficient leaves (lack of nitrogen)

e.g.

The has been a deficient supply of water in our town.

She is deficient in many of the qualities needed to make herself a good teacher.

Common Errors:

Any electronic goods that are found to be defect are replaced.       [wrong]

Any electronic goods that are found to be defective are replaced.  [right]

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