effective
adjective
uk/ɪˈfektɪv/ ussuccessful in achieving the result that you want:
You need a workable, effective strategy for developing your business.
Personal charisma alone does not make someone an effective leader.
The consumer council must have clear duties and strong powers if it is to be effective.
having started to operate or be used:
The new Investment Management Agreements became effective on 1st November.
He announced his resignation, effective immediately.
[ before noun ]
used to describe what is actually true, although it may not be intended or stated:
The remainder of the stock is owned by a consortium of banks which are in effective control of the hotel.
See also
cost-effective