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What is the opposite of inefficacious?

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

Opposite of having no real use, point or meaning
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Opposite of having the desire to do idealistic deeds without pragmatism
Opposite of not able to work or function as expected
Opposite of having no effect or not in operation
“I cannot believe that after all these years, without upgrades, your computer is still operational.”
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