working well, quickly, and without waste
"an efficient production manager"
"efficient engines save gas"
"people who will do nothing unless they get something out of it for themselves are often highly effective persons..."
"an efficient secretary"
"the efficient cause of the revolution"
He was an expert and efficient workman.
出自： H. B. Stowe
The appeal to sentiment was heartlessly efficient; it had struck him in the place where he was most vulnerable and at the hour when he was most alone.
出自： G. Greene
He's not very efficient:he works very slowly.