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efficacious
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Harry Potter (#6) and the Half-Blood Prince
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efficacious
Used In
Harry Potter (#6) and the Half-Blood Prince
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  • "I do thank you for taking the time, Pomona," Slughorn was saying courteously, "most authorities agree that they are at their most efficacious if picked at twilight."

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  • The drug is safe and efficacious.
  • He would weep for hours together, and I verily believe that to the very end this spoiled child of life thought his weak tears in some way efficacious.
    H.G. Wells  --  The War of the Worlds

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