Defective-Deficient | Commonly Confused Words
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Master confusing words with ease

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 often implies something is broken or not working correctly, while deficient means lacking or insufficient in some way.
  • Defective items are usually unusable without repair, whereas deficient items might still function but not optimally.
  • Think of defective as relating to flaws or malfunctions, while deficient often relates to missing qualities or inadequacies.
  • A defective product might have a manufacturing error; a deficient product might be missing features or qualities.
  • Deficient deals more with shortages, such as insufficient vitamins or nutrients, while defective is about faults or errors in function.
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