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Opposite words of effectiveness
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fantasy, light, mood
background, christmas
lantern, lamp, brand
fantasy, city, architecture
sunset, silhouette, evening
background, backdrop, abstract

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Antonyms for Effectiveness. (2016). Retrieved 2021, June 24, from https://thesaurus.plus/antonyms/effectiveness
Antonyms for Effectiveness. N.p., 2016. Web. 24 Jun. 2021. <https://thesaurus.plus/antonyms/effectiveness>.
Antonyms for Effectiveness. 2016. Accessed June 24, 2021. https://thesaurus.plus/antonyms/effectiveness.