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ineffective
mastery UK /ˌɪn.ɪˈfɛk.tɪv/ US /ˌɪn.əˈfek.tɪv/adj
card 1 of 2 · preposition
The old antibiotics proved ineffective _____ the new strain of bacteria.
card 1 of 2 · preposition
The old antibiotics proved ineffective _____ the new strain of bacteria.