Effectively
Part of speech: adverb
Definition: In an efficient or effective manner; with powerful effect. Essentially; for all practical purposes.
Example sentence: Great is truth, but still greater, from a practical point of view, is silence about truth. By simply not mentioning certain subjects... totalitarian propagandists have influenced opinion much more effectively than they could have by the most eloquent denunciations.
Efficaciously
Part of speech: adverb
Definition: In an efficacious manner