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deficient (adj.)

1580s, "lacking, wanting, incomplete;" c. 1600 "not having a full or adequate supply," from Latin deficientem (nominative deficiens), present participle of deficere "to desert, revolt, fail," from de "down, away" (see de-) + combining form of facere "to do, make" (from PIE root *dhe- "to set, put"). Compare defective. Related: Deficiently.

Origin and meaning of deficient

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Definitions of deficient from WordNet

deficient (adj.)
inadequate in amount or degree;
a deficient education
deficient in common sense
Synonyms: lacking / wanting
deficient (adj.)
of a quantity not able to fulfill a need or requirement;
Synonyms: insufficient
deficient (adj.)
falling short of some prescribed norm;
Synonyms: inferior / substandard
From wordnet.princeton.edu