Select the word that is similar in meaning (SYNONYM) to the word given below

Efficacy

Efficiency

The word that is most similar in meaning to "efficacy" is Option 2: efficiency.

• Efficacy means "the ability to produce a desired effect."
• Efficiency means "the ability to do something well or productively, without wasting time or resources."

Both words suggest the ability to achieve a desired outcome.

The other options are not synonyms of "efficacy."

• Impotence means "the inability to achieve a desired effect."
• Ineptness means "lack of skill or ability."
• Futility means "the quality of being useless or pointless."