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deficient

/dɪˈfɪʃənt/ adjective C2
  1. Lacking something essential; often construed with in. · They were deficient in social skills.· His voice is beautiful but deficient in power.
  2. Insufficient or inadequate in amount.
  3. Of a number n, Having the sum of divisors σ(n) < 2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n) < n.
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From the library

But Josie Pye, if deficient in some qualities that make for popularity, had at least a natural and inborn gift, duly cultivated, for walking board fences.
Anne of Green Gables, p. 174 · C1
They were, in fact, very fine ladies; not deficient in good-humour when they were pleased, nor in the power of being agreeable where they chose it; but proud and conceited.
Pride and Prejudice, p. 15 · B2
Bingley was by no means deficient; but Darcy was clever.
Pride and Prejudice, p. 16 · B2
It only shows her being deficient in something herself--sense or feeling.”
Pride and Prejudice, p. 178 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.