Ineffective
/ˌɪnɪˈfɛktɪv/
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Definition
(adj) Not having the desired effect; ineffectual; otiose.
Sentence Examples
The 5% topical solution was ineffective at reducing eczema outbreaks.
A plethora of ineffective education programs made the president unpopular amongst fiscal conservatives.
CEFR Practice Quiz
The new medicine proved to be ____ at treating the common cold, according to recent studies.