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In the following question, out of the given four alternatives, select the one which is opposite in meaning to the given word.
Efficacious

  1. A
    Powerful
  2. B
    Useless
  3. C
    Successful
  4. D
    Good

Solution & Step-by-step Explanation

Efficacious means successful in producing a desired or intended result; effective.
Let's check the options:

Useless: Not fulfilling or not expected to achieve the intended purpose or result (Exact opposite/Antonym).

Powerful / Successful / Good: These are positive words that lean toward the meaning of being effective.

Thus, 'Useless' is the correct antonym.

Practice this question

Try it yourself before checking the explanation above.

In the following question, out of the given four alternatives, select the one which is opposite in meaning to the given word.
Efficacious
A
Powerful
B
Useless
C
Successful
D
Good

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