Not effective antonyms

What is the opposite word for Not effective?

Antonyms for not effective
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Opposite words of not effective
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town sign, road, useful
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Antonyms for Not effective. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/antonyms/not_effective
Antonyms for Not effective. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/antonyms/not_effective>.
Antonyms for Not effective. 2016. Accessed August 13, 2026. https://thesaurus.plus/antonyms/not_effective.