effective

Exerting force or influence.

“the law is effective immediately”

Producing or capable of producing an intended result or having a striking effect.

“an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation”

“effective teaching methods”

Able to accomplish a purpose; functioning effectively.

“people who will do nothing unless they get something out of it for themselves are often highly effective persons...”

“effective personnel”

Existing in fact; not theoretical; real.

“a decline in the effective demand”

“confused increased equipment and expenditure with the quantity of effective work done”

Ready for service.

“the fort was held by about 100 effective soldiers”

Works well as a means or remedy.

“an effective reprimand”

“a lotion that is effective in cases of prickly heat”