1
the ineffectiveness of sth
常见搭配，用 of 引出无效的对象；该词通常作不可数名词。
We discussed the ineffectiveness of the old training method.
我们讨论了旧培训方法的无效性。
无效；不起作用
ineffectivenesses — plural of ineffectiveness
先理解核心含义，再看它在真实句子里的用法。
无效；不起作用
the condition of being ineffective
We discussed the ineffectiveness of the old training method.
我们讨论了旧培训方法的无效性。
无效的状态
The condition of being ineffective
The ineffectiveness of the old medicine made the doctor prescribe a stronger one.
旧药无效，医生只好开了更强的药。
Many customers complained about the ineffectiveness of the new cleaning product.
许多顾客抱怨这款新清洁产品不起作用。
She was frustrated by the ineffectiveness of her study methods.
她对学习方法不起效果感到沮丧。
常见搭配，用 of 引出无效的对象；该词通常作不可数名词。
We discussed the ineffectiveness of the old training method.
我们讨论了旧培训方法的无效性。
in 后接名词或动名词，说明在哪方面无效。
The manager was criticized for his ineffectiveness in resolving conflicts.
这位经理因解决冲突不力而受到批评。
与 expose、reveal 等动词连用，表示揭示某种无效状态。
The data exposed the ineffectiveness of the new system.
这些数据暴露了新系统的无效性。
Not this
The ineffective of the new policy caused many problems.
Use this
The ineffectiveness of the new policy caused many problems.
ineffective 是形容词，不能作名词主语；表示‘无效’这一状态应用名词 ineffectiveness。
Not this
This is an ineffectiveness method.
Use this
This is an ineffective method.
ineffectiveness 是名词，不能修饰名词；作定语表示‘无效的’应用形容词 ineffective。
Not this
We cannot tolerate an ineffectiveness in the process.
Use this
We cannot tolerate ineffectiveness in the process.
ineffectiveness 为不可数抽象名词，表示泛指时前面不加不定冠词 an。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
治疗无效
The study confirmed the ineffectiveness of the treatment.
该研究证实了这种治疗无效。
凸显无效性
The report highlighted the ineffectiveness of current policies.
报告凸显了现行政策的无效性。
证明无效
These results demonstrate the ineffectiveness of the old approach.
这些结果证明了旧方法的无效。
人们认为的无效性
The perceived ineffectiveness of the measures led to public frustration.
人们认为这些措施无效，导致了公众不满。
对无效性的不满
There is growing frustration at the ineffectiveness of the negotiations.
人们对谈判毫无成效越来越不满。
Use ineffectivenesses naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住 in- 表“不”，effect 是“效果”，-ness 名词化：没效果就是 ineffectiveness（无效）。
语域：neutral 常见场景：academic writing、policy reports、general discussion ineffectiveness 是 ineffective 的名词形式，表示“无效”的状态。该词比较中性，但多用于书面或正式场合，如报告、文章和讨论中；日常口语里更常说 it doesn't work 或 how ineffective it is。
Only effectiveness rhymes with ineffectiveness (stressed /fɛk/ plus /tɪvnəs/). The other -ness words share the unstressed suffix /nəs/ but have different stressed vowels, so they are spelling matches, not rhymes. Ineffective looks similar but lacks the final /nəs/ and ends in /tɪv/, so it does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.