efficient

• "an efficient production manager"
• "efficient engines save gas"

• "functioning effectively"
• "people who will do nothing unless they get something out of it for themselves are often highly effective persons...-G.B.Shaw"
• "effective personnel"
• "an efficient secretary"
• "the efficient cause of the revolution"

Synonyms

• effectiveproducing or capable of producing an intended result or having a striking effect; able to accomplish a purpose; works well as a means or remedy; exerting force or influence; existing in fact; ready for service