Might mean (unverified): Less effective than fully efficient.
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We found one dictionary that defines the word subefficient:

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  1. subefficient: Wiktionary

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Definitions from Wiktionary (subefficient)

▸ adjective:  Not efficient, inefficient

Similar:
nonefficient, inefficient, suboptimum, underproductive, subefficacious, unefficient, undeficient, undereffective, sub-optimal, subsignificant, more...

Opposite:
superior, efficient, effective, productive, proficient

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Similar:
nonefficient, inefficient, suboptimum, underproductive, subefficacious, unefficient, undeficient, undereffective, sub-optimal, subsignificant, more...

Opposite:
superior, efficient, effective, productive, proficient



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