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Definition of efficient:

  1. An efficient cause; a prime mover.
  2. Causing effects; producing results; that makes the effect to be what it is; actively operative; not inactive, slack, or incapable; characterized by energetic and useful activity; as, an efficient officer, power.


active, thrifty, worthwhile, operative, adequate, productive, in force, businesslike, serviceable, tough, thrive, fitted, effective, fitting, hard-working, underspent, practiced, profitable, decisive, good, high-powered, equal to, committed, valuable, suited, effectual, economic, diligent, sedulous, shrewd, experienced, economical, qualified, adapted, in effect, energetic, cost-efficient, conducive, fruitful, helpful, efficacious, incompetent, saving, practical, familiar with, high-octane, streamlined, cost-effective, industrious, inefficient, ineffectual, functional, timesaving, expeditious, conscientious, assiduous, competent, tireless, potent, dynamic, prompt.

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