Webster's English Dictionary

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deficient

1. de.fi.cient \di-'fish-*nt\ aj [L deficient-, deficiens, prp. of deficere 
   to be wanting -]more at DEFECT 1: lacking in some necessary quality or 
   element {~ in judgment}  2: not up to a normal standard or complement : 
   DEFECTIVE  - de.fi.cient.ly av
2. deficient n : one that is deficient {a mental ~}