INEFFICIENT
ineffective, inefficient
(adjective) lacking the ability or skill to perform effectively; inadequate; “an ineffective administration”; “inefficient workers”
inefficient
(adjective) not producing desired results; wasteful; “an inefficient campaign against drugs”; “outdated and inefficient design and methods”
Source: WordNet® 3.1
Etymology
Adjective
inefficient (comparative more inefficient, superlative most inefficient)
Not efficient; not producing the effect intended or desired; inefficacious
Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing
Antonyms
• efficient
Noun
inefficient (plural inefficients)
A person who cannot or does not work efficiently.
A general shaking up of the workers from top to bottom would result; and when equilibrium had been restored, the number of the inefficients at the bottom of the Abyss would have been increased by hundreds of thousands.
Source: Wiktionary
In`ef*fi"cient, a.
1. Not efficient; not producing the effect intended or desired;
inefficacious; as, inefficient means or measures.
2. Incapable of, or indisposed to, effective action; habitually slack
or remiss; effecting little or nothing; as, inefficient workmen; an
inefficient administrator.
Source: Webster’s Unabridged Dictionary 1913 Edition