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What is another word for inefficacious?

Pronunciation:

[ ɪnɪfɪkˈe͡ɪʃəs], [ ɪnɪfɪkˈe‍ɪʃəs], [ ɪ_n_ɪ_f_ɪ_k_ˈeɪ_ʃ_ə_s]

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Definitions for inefficacious

Opposite words for inefficacious:
X