1. effective
Do you think you have to be able to pass for a native speaker to be an effective spy?
I hear that studying in the morning is more effective. Studying one hour in the morning is as good as three hours at night.
OPP ineffective
I hope you're prepared to communicate under these conditions, because e-mail is most effective and convenient when different time zones are taken into consideration.
Everyone has the right to an effective remedy by the competent national tribunals for acts violating the fundamental rights granted him by the constitution or by law.
These quotations were effective in sending complex messages to his friends, because, in his day, people could quote from such authors with every expectation of being understood.
My father achieved that and more in four words, which made quoting Shakespeare as effective as any business adviser could wish.
The most effective means for the propagation of Esperanto is the fluent and elegant use of this language.
In order to bring about an effective agreement of wills, it is not sufficient to study other languages.
As of midnight tonight the contract becomes effective.
The art of modern warfare does not necessarily require soldiers to be armed to the teeth to be effective as combatants.
1. That picture would look more effective on a dark background. 2. The soldiers gained effective control of the town.
An effective writer is one who knows what sort of words should be employed in any specific context.
Out of the four policies that were suggested, I think the most effective one would be the "Improvement of Preventive Care and Health Promotion" policy.
Girls wearing mini-skirts, walking or sitting, are very effective eye-openers.
2. effectively
Studying how to communicate effectively is time well spent.
Last year, I spent so much time by myself that I almost forgot how to communicate effectively with others.
I wanted to work more effectively to get promoted.
Each country has its own system, and all of them work more or less effectively.
What can we do to manage projects more effectively?
The new working practices, along with more efficient machinery, have effectively doubled the production of new cars.
In the midst of the dollar falling hard against the Yen and other major Eastern currencies the Chinese Yuan, with China effectively taking a 'dollar peg' policy, has become cheap.
Deposed in a military coup in September 2006 and having effectively been in exile, the Former premier of Thailand Thaksin has returned after about a year and a half.
The fact that educated Americans in general no longer share understandable background knowledge is a chief cause of their inability to communicate effectively.
It is important to think over what you will do, to pursue your studies economically, and effectively.
Effectively dealing with competition is an important part of life.
Knowing their languages is not enough to communicate effectively, because the methods of communication are determined by their cultures.
It is how effectively you use the available time that counts.
His suggestion was, effectively, an order.
3. effectiveness
This unit of the factory should improve their effectiveness or it will be closed.
teacher effectiveness
As yardsticks to measure the effectiveness of information retrieval there exist those called 'recall ratio' and 'precision ratio'.
Many fear that cuts in the defense budget will undermine the military's effectiveness.