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deficient

adjective

Synonyms and Antonyms of deficient

1 lacking some necessary part
  • A diet deficient in calcium can lead to weak bones.
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2 falling short of a standard
  • Woefully deficient eyesight kept him out of military service.
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Phrases Synonymous with deficient

below par (or under)

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3 not coming up to an expected measure or meeting a particular need
  • too deficient in experience to handle the situation by himself
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