| adjective | being effective without wasting time or effort or expense “an efficient production manager” |
| adjective | able to accomplish a purpose; functioning effectively; -G.B.Shaw “people who will do nothing unless they get something out of it for themselves are often highly effective persons...” |
| efficiency | noun | skillfulness in avoiding wasted time and effort |
| effect | verb | produce |
| effectiveness | noun | power to be effective; the quality of being able to bring about an effect |
| effectivity | noun | power to be effective; the quality of being able to bring about an effect |