inefficacy
/ɪnˈɛfɪkəsi/
noun
- Lack of ability to produce the desired effect; ineffectiveness.
- Many people complained about the inefficacy of the air purifier in removing smoke.
- The inefficacy of the vaccine against the new variant was a major concern.
- The inefficacy of the team's strategy became obvious after they lost three games in a row.
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