Efficient
Merriam-Webster Online Dictionary
efficient (adjective)1.
being or involving the immediate in producing an effect - agent the efficient action of heat in changing water to steam
2.
productive of desired effects , especially productive without waste - an efficient worker effective
Merriam-Webster Online Thesaurus
efficient (adjective)producing or capable of producing a desired result
SYNONYMS:
effectual, efficacious, efficient, fruitful, operative, potent, productiveRELATED WORDS:
hyperefficient, ultraefficient; adequate, capable, competent; accomplished, adept, consummate, experienced, expert, masterly, practiced ( practised), proficient, skilled, skillful, versed, veteran, virtuoso; cogent, convincing, killer, sound, striking, telling, valid; active, dynamic; useful, working; applicable, feasible, functional, practicable, practical, realizable, usable ( useable), workableNEAR ANTONYMS:
counterproductive; incapable, incompetent, inexperienced, inexpert, unqualified, unseasoned, unskilled, unskillful; abortive, bootless, futile, vain; empty, hollow, idle, pointless, unavailing, unprofitable, unsuccessful; inoperative, worthless