Defective-Deficient | Commonly Confused Words
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Defective vs. Deficient

Defective

/dɪˈfektɪv/
Having a problem or fault that prevents it from working correctly

Examples:

The recall was due to the defective airbags installed.Detecting the defective gene is key for the diagnosis.The product had a defective seal, causing leaks.

Synonyms:

Antonyms:

Deficient

/dɪˈfɪʃənt/
Lacking in something necessary or required

Examples:

Her report was deficient in key statistics.The deficient soil yielded poor crop results.His deficient knowledge led to frequent errors.

Synonyms:

Antonyms:

Ways to tell them apart:

etymology
  • Defective and deficient both describe something that is not perfect, but the nuance is important.
  • Defective suggests the presence of a flaw or fault that prevents normal operation.
  • Deficient suggests a shortage or lack of quality, quantity, or strength in something.
  • Think of a defective product as broken, while a deficient product just hasn't met a certain standard or volume.
  • A device could be defective if it doesn’t work; a deficient device might work but not up to expected standards.
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