different between unqualified vs inefficient

English

un- +? qualified.

unqualified (comparative more unqualified, superlative most unqualified)

Not qualified, ineligible, unfit for a position or task.
Synonyms: ineligible, nonqualified
Antonyms: competent, eligible, qualified
Not elaborated upon, or not accompanied by restrictions or qualification; undescribed.
Synonym: undescribed
Antonyms: described, qualified
Outright; thorough; utter.
- 1857, Irish Literary Gazette
  Gibson is an unqualified fool, and only fit to mix with beasts of the same calibre; […]

in- +? efficient

inefficient (comparative more inefficient, superlative most inefficient)

Not efficient; not producing the effect intended or desired; inefficacious
Celery is an inefficient food.
Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing
- 1987, Ronald Reagan, Presidential Radio Address January 17, 1987
  The Defense Department, for example, has greatly expanded competitive bidding and is this year submitting to Congress the first-ever 2-year defense budget to replace the old, inefficient, year-by-year process.
Jessica was terribly inefficient at cleaning, so her brother usually had to clean the whole room.

inefficient (plural inefficients)

A person who cannot or does not work efficiently.
- 1889, New York (State). Dept. of Labor. Bureau of Statistics, Annual Report (part 2, page 127)
  Two men were put to work who could not set their looms; a third man was taken on who helped the inefficients to set the looms. The other weavers thought this was a breach of their union rules and 18 of them struck […]
- 1903, Jack London, The People of the Abyss Chapter 17
  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.

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