[ef.fi.ca.cious] adj [L efficac-, efficax, fr. efficere] (1528): having the power to produce a desired effect syn see effective -- ef.fi.ca.cious.ly adv -- ef.fi.ca.cious.ness n
EFFICACIOUS
Meaning of EFFICACIOUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012