What are the antonyms for INEFFICACIOUS?

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Usage Examples for INEFFICACIOUS

  1. The original English privative is un; but as we often borrow trom the Latin, or its descendants, words already signifying privation, as inefficacious, impious, indiscreet, the inseparable particles un and in have fallen into confusion, from which it is not easy to disentangle them. - "A Grammar of the English Tongue" by Samuel Johnson
  2. Had his aunt merely told him that his present would be inefficacious, he would have taken that assurance as being simply her opinion, and would have still entertained some hopes in the diamonds. - "Ayala's Angel" by Anthony Trollope