Etymology
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inefficient (adj.)

1748, "not producing or incapable of producing the desired effect," from in- (1) "not, opposite of" + efficient. Related: Inefficiently.

updated on November 19, 2015

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Definitions of inefficient from WordNet

inefficient (adj.)
not producing desired results; wasteful;
outdated and inefficient design and methods
an inefficient campaign against drugs
inefficient (adj.)
lacking the ability or skill to perform effectively; inadequate;
inefficient workers
Synonyms: ineffective
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.