1
the unpleasantness of sth
此结构中的 unpleasantness 表示某事物令人不快的性质，通常作不可数名词。
The unpleasantness of the situation made everyone uncomfortable.
这种局面的不愉快让每个人都不自在。
不愉快；不快
unpleasantnesses — plural of unpleasantness
先理解核心含义，再看它在真实句子里的用法。
不愉快；不快
a feeling of being unpleasant or disagreeable
The unpleasantness of the situation made everyone uncomfortable.
这种局面的不愉快让每个人都不自在。
令人不快或令人讨厌的性质。
The property of being unpleasant or disagreeable.
令人不愉快的行为、事件等。
An unpleasant behaviour, occurrence, etc.
The smell in the room caused a feeling of unpleasantness.
房间里的气味引起了一种不愉快的感觉。
He apologized to avoid any unpleasantness between the neighbors.
他道了歉，以避免邻居之间出现任何不快。
We all felt the unpleasantness of the long wait.
我们都感受到了长时间等待的不快。
此结构中的 unpleasantness 表示某事物令人不快的性质，通常作不可数名词。
The unpleasantness of the situation made everyone uncomfortable.
这种局面的不愉快让每个人都不自在。
unpleasantness 可指争执或不快事件，常用于 there be 句型，并与 between 或 with 连用。
There was some unpleasantness between the two colleagues.
两位同事之间有些不愉快。
Not this
The unpleasant of the weather made us stay indoors.
Use this
The unpleasantness of the weather made us stay indoors.
unpleasant 是形容词，不能直接作名词；表示“不快、令人不快的性质”应用名词 unpleasantness。在 the ... of ... 结构中需要名词。
Not this
She is an unpleasantness person.
Use this
She is an unpleasant person.
unpleasantness 是名词，不能修饰 person；修饰名词应该用形容词 unpleasant。这里表示“令人不快的”，应把名词换成形容词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
避免不快；避免争执
I said nothing to avoid unpleasantness.
为了不引起不快，我什么也没说。
引起不快；制造争执
The argument caused unpleasantness between the two friends.
这场争吵引起两个朋友之间的不愉快。
小小的不愉快；小风波
There was a bit of unpleasantness over the bill.
关于账单产生了一点不愉快。
家庭不睦；家中的争吵
Their financial problems led to domestic unpleasantness.
他们的经济问题导致了家庭不睦。
不必要的不快；无谓的争执
Let's avoid any unnecessary unpleasantness at the reunion.
让我们避免聚会上任何不必要的不快。
（尤指美国内战的婉称）最近的战事，最近的不愉快事件
Some older Southerners still refer to the Civil War as 'the late unpleasantness'.
一些上了年纪的南方人仍把美国内战称为‘最近的那场不愉快战事’。
（英式口语）一点不愉快，小争执
We had a bit of unpleasantness at the meeting yesterday.
昨天开会时我们发生了一点不愉快。
（对家庭纠纷或家庭暴力的委婉说法）家庭不愉快
The quiet street was shocked by the domestic unpleasantness at number 20.
20号那户人家的家庭冲突让这条安静的街道感到震惊。
贝洛娜俱乐部的不愉快事件
In the title of this classic mystery novel, the word 'unpleasantness' refers to a murder investigation.
在这部经典推理小说的书名中，unpleasantness 一词指一桩谋杀案的调查。
Use unpleasantnesses naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：pleasant 里有 ant（蚂蚁），野餐时遇到蚂蚁令人不快；加上 un- 和 -ness，就是 unpleasantness（不愉快）。
语域：mixed 常见场景：formal writing、polite or diplomatic conversation、news reporting 该词作名词时通常带委婉色彩，多用于正式或礼貌场合，表示“不快的感觉”或“不愉快的事/争执”；日常口语中较少直接用，而会用更具体或随意的说法。
与 pleasantness 的 /ˈplɛzəntnəs/ 完全押韵（重读元音及之后相同）。unpleasant 拼写很接近，且重读部分相同，但以 /nt/ 结尾，缺少 /nəs/，不押韵；happiness、illness、kindness、sadness 虽都带 -ness，但重读元音和后续辅音不同，均不押韵。
Dictionary facts from ECDICT, WIKTIONARY.