inefficacious - WordReference.com Dictionary of English

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  - inedible
  - ineducable
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  - ineffective
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inefficacious

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Concise Oxford English Dictionary © 2008 Oxford University Press:
inefficacious /ˌɪnɛfɪˈkeɪʃəs/

▶adjective not producing the desired effect.

– derivatives
inefficacy noun.

'inefficacious' also found in these Oxford entries:

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