What is the opposite of inefficacy?

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

Noun
Opposite of the condition of being ineffective
Noun
Opposite of a lack of ability or competency for a given task
Noun
Opposite of pointlessness or uselessness
Noun
Opposite of something that impedes, or stands in the way of, progress
“My termination turned out to be a blessing as I ended up with a bigger salary at my new job.”
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