What is the opposite of inefficaciousness?

Need antonyms for inefficaciousness? Here's a list of opposite words from our thesaurus that you can use instead.

Noun
The effect or influence of something, typically a chemical or substance
“People should be educated on the action of illicit drugs on the human body.”
Noun
The effects or influence of something, typically a chemical or substance
“People should be educated on the actions of illicit drugs on the human body.”
Noun
The ability or capacity to do something
“He was an outstanding speaker with the power to charm and invigorate his audience.”
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