inefficacious
/ˌɪnɛfɪˈkeɪʃəs/
adjective
- Not producing the desired effect; failing to achieve the intended result.
- Many home remedies for colds are inefficacious according to scientific studies.
- Despite hours of negotiation, the peace talks were inefficacious and the conflict continued.
- The old medicine proved inefficacious against the new strain of the virus.
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