What does the word efficacious mean?

Usage examples for efficacious

  1. A more melancholy sight it was impossible to behold; but so efficacious was this treatment, that for more than two years I hardly ever saw a monkey in the neighbourhood." – Anecdotes of the Habits and Instinct of Animals by R. Lee
  2. This threat was much more efficacious than those of the half- witted man had been, and the boys at once took to their heels. – At Agincourt by G. A. Henty
  3. Dreams which give timely notice of coming accidents are, unfortunately, quite as often useless as they are efficacious for the protection of those to whom they are sent. – Real Ghost Stories by William T. Stead
  4. Conforming his conduct to the theme of his verse would surely be no more efficacious than attempting to lift himself by his own boot straps. – The Poet's Poet by Elizabeth Atkins

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