efficaciously

from WordNet (r) 3.0 (2006)

efficaciously
    adv 1: in an effective manner; "these are real problems that can
           be dealt with most effectively by rational discussion"
           [syn: {efficaciously}, {effectively}] [ant:
           {ineffectively}, {inefficaciously}]

from The Collaborative International Dictionary of English v.0.48

Efficacious \Ef`fi*ca"cious\, a. [L. eficax, -acis, fr.
   efficere. See {Effect}, n.]
   Possessing the quality of being effective; productive of, or
   powerful to produce, the effect intended; as, an efficacious
   law.

   Syn: See {Effectual}. -- {Ef`fi*ca"cious*ly}, adv.
        [1913 Webster]