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1. Oxford American Dictionary

   inefficacious

   • IPA[ˈinefiˈkāSHəs]

   美式

   • adj.
     not producing the desired effect.
2. • 更多解釋

   inefficacious

   • IPA[ˌɪnɛfɪˈkeɪʃəs]

   英式

   • adj.
     not producing the desired effect: social conventions honed over thousands of years were suddenly inefficacious

   Oxford Dictionary