Civil Service Exam Reviewer · Synonyms · hard

Choose the word that is CLOSEST IN MEANING to the word in capital letters in the sentence: "The new vaccine proved EFFICACIOUS against the virus."

  1. ineffectual
  2. effective
  3. effusive
  4. officious

Answer

B. effective

Solution

EFFICACIOUS means "successful in producing the intended result," so the closest in meaning is "effective."

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