一：appropriateness的意思是“适当性”、“恰当性”、“相称性”。用法是作为名词，表示某个事物或行为是否符合特定的标准或要求。

例句：

1. The appropriateness of her outfit for the formal event was questioned by the . (她穿的服装是否适合这场正式活动，遭到了主持人的质疑。)

2. The appropriateness of using this method in such a situation is questionable. (在这种情况下使用这种方法是否合适，值得怀疑。)

3. The teacher always emphasizes the importance of appropriateness in communication. (老师总是强调沟通中的恰当性很重要。)

4. The appropriateness of his behavior towards his subordinates was praised by his boss. (他对下属的行为是否得体，受到了老板的赞扬。)

5. She questioned the appropriateness of their decision to get married after only knowing each other for a month. (她质疑两人仅在认识一个月后就决定结婚的恰当性。)

二：怎么读（音标）：[əˌproʊpriˈeɪtnəs]

三：用法：作为名词，表示某个事物或行为是否符合特定的标准或要求。

四：例句1-5句且中英对照：

1. The appropriateness of her outfit for the formal event was questioned by the . (她穿的服装是否适合这场正式活动，遭到了主持人的质疑。)

2. The appropriateness of using this method in such a situation is questionable. (在这种情况下使用这种方法是否合适，值得怀疑。)

3. The teacher always emphasizes the importance of appropriateness in communication. (老师总是强调沟通中的恰当性很重要。)

4. The appropriateness of his behavior towards his subordinates was praised by his boss. (他对下属的行为是否得体，受到了老板的赞扬。)

5. She questioned the appropriateness of their decision to get married after only knowing each other for a month. (她质疑两人仅在认识一个月后就决定结婚的恰当性。)

五：同义词及用法：suitability（适合性）、fitness（合适）、rightness（正确性）等。

六：编辑总结：appropriateness是一个表示某个事物或行为是否符合特定标准或要求的名词，常用于形容衣着、行为、决定等方面。其同义词包括suitability、fitness、rightness等，可以根据具体语境选择使用。在表达时需要注意搭配正确的介词，如“the appropriateness of…for…”、“question the appropriateness of…”等。