1
ineffective in doing sth
The treatment proved ineffective in curing the disease.
这种治疗方法在治愈疾病方面被证明无效。
无效的；不起作用的
先理解核心含义，再看它在真实句子里的用法。
无效的；不起作用的
not producing the intended result or having the desired effect
The treatment proved ineffective in curing the disease.
这种治疗方法在治愈疾病方面被证明无效。
没有预期效果的；无效的；无用的。
Not having the desired effect; ineffectual; otiose.
未产生预期效果的
not producing an intended effect
缺乏能力；不称职或不够格的。
Lacking in ability; incompetent or inadequate.
缺乏力量或效力的
lacking in power or forcefulness
The new medicine proved ineffective against the virus.
这种新药被证明对病毒无效。
AI contextual example
Her attempts to negotiate were ineffective because she lacked authority.
她试图谈判，但因缺乏权威而无效。
AI contextual example
The ineffective heating system left the office cold all winter.
低效的供暖系统使整个办公室冬天都很冷。
AI contextual example
an ineffective teacher
一位不称职的教师。
WordNet
The treatment proved ineffective in curing the disease.
这种治疗方法在治愈疾病方面被证明无效。
She was ineffective at communicating her ideas to the team.
她不善于向团队传达自己的想法。
The old antibiotics were ineffective against the new strain of bacteria.
旧抗生素对这种新细菌菌株无效。
Not this
The government's plan proved an ineffective.
Use this
The government's plan proved ineffective.
在英语中，形容词'ineffective'不能直接用作名词。正确用法是直接作表语或定语，无需冠词。中文学习者常受汉语'一个无效的'影响，误加冠词。应去掉冠词'an'，直接使用形容词作表语。
Not this
This method is ineffective because it wastes too much time.
Use this
This method is inefficient because it wastes too much time.
'ineffective'指'不起作用、无效'，而'inefficient'指'效率低、浪费资源'。这里强调浪费时间导致效率低，应使用'inefficient'。中文学习者容易混淆这两个词，因为汉语'无效'和'低效'有时混用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
被证明无效
The new policy proved ineffective in reducing crime.
这项新政策在减少犯罪方面被证明无效。
使无效
The medication was rendered ineffective by the heat.
这种药物因高温而失效。
无效的策略
We need to abandon this ineffective strategy.
我们需要放弃这个无效的策略。
无效的治疗
The patient was given an ineffective treatment for his condition.
患者接受了对其病情无效的治疗。
无效的领导
The team suffered from ineffective leadership.
团队因领导不力而受损。
无效的措施
The government took ineffective measures to control inflation.
政府采取了无效的措施来控制通胀。
Use ineffective naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
无效的：in（不）+ effective（有效），合起来就是没效果。
通常用于正式或非正式场合，形容方法、措施等未达到预期效果，常见于工作、学习及政策讨论中。
Words ending in -ective (effective, defective, infective, collective) rhyme with ineffective, sharing the stressed vowel /ɛ/ and ending /ktɪv/. Words beginning with in- (inefficient, inactive) are useful lookalikes but do not rhyme; note the different vowel sounds /ɪˈfɪʃ/ and /ˈæk/.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.