adj.无用的；无效果的

The medication proved to be utterly inefficacious against the severe infection.
这种药物对严重的感染证明是完全无效的。
The new marketing strategy was found to be inefficacious in boosting sales.
新的营销策略被发现对于提高销售额毫无效果。
The government's economic policies were declared inefficacious due to their inability to stimulate growth.
政府的经济政策因无法刺激经济增长而被宣告无效。
The ineffectiveness of traditional farming methods led to a decline in crop yields.
传统农耕方法的无效率导致作物产量下降。
His attempts at persuasion were consistently inefficacious, as she remained stubbornly unmoved.
他试图说服的努力总是无效的，因为她固执地不愿改变。
The proposed reform was deemed inefficacious by experts, who argued for more radical changes.
专家认为提出的改革是无效的，他们主张进行更激进的变革。
The teacher's efforts to discipline the unruly students turned out to be inefficacious.
老师试图管教那些不守规矩的学生的努力最终证明是无效的。
The ineffectual antivirus software failed to protect the computer from malware.
效果不佳的防病毒软件未能保护电脑免受恶意软件侵害。
The politician's promises to address poverty proved inefficacious, as poverty rates continued to rise.
政客承诺解决贫困问题的努力证明是无效的，因为贫困率仍在上升。
The old medicine was replaced with a newer, more efficacious alternative for treating chronic pain.
旧药被用于治疗慢性疼痛的新、更有效的替代品所取代。