1
be unkind to sb
表示“对某人不友善”时，介词用 to。
She was unkind to the new student.
她对新生不友善。
不友善的；冷酷的；刻薄的
unkinder — comparative of unkind
先理解核心含义，再看它在真实句子里的用法。
不友善的；冷酷的；刻薄的
Not kind; cruel or harsh.
She was unkind to the new student.
她对新生不友善。
不仁慈的；残忍的；不公正的；忘恩负义的。
Lacking kindness, sympathy, benevolence, gratitude, or similar; cruel, harsh or unjust; ungrateful.
缺乏善良
lacking kindness
缺乏人道和善意的情感
deficient in humane and kindly feelings
It was unkind of him to laugh at her mistake.
他嘲笑她的错误，真是不够厚道。
AI contextual example
Please don't be unkind to the new student; she is still settling in.
请别对新同学不友善，她还在适应。
AI contextual example
Her unkind words made him feel hurt for days.
她那刻薄的言语让他难受了好几天。
AI contextual example
a thoughtless and unkind remark
一个无心且不友善的评论
WordNet
表示“对某人不友善”时，介词用 to。
She was unkind to the new student.
她对新生不友善。
此句型用 of 引出行为主体，说明某人的做法不厚道。
It was unkind of him to say that.
他那样说很不友善。
unkind 作定语时，常修饰 remark、word、act 等名词。
He made an unkind remark about her clothes.
他对她的衣着说了一句刻薄的话。
Not this
She was unkind with me.
Use this
She was unkind to me.
“unkind to somebody” 是固定搭配，表示对某人态度不好；介词用 to 指承受这种态度的人，不能用 with。
Not this
He behaved unkind to his classmates.
Use this
He behaved unkindly to his classmates.
behave 是动词，需要用副词修饰；unkind 是形容词，不能修饰动词，应改用副词 unkindly。
Not this
It was unkind for him to say that.
Use this
It was unkind of him to say that.
对“某人做某事不友善”这类评价性表达，形容词 + of somebody 是固定结构（如 kind/nice/mean of somebody），因为评价对象是人；用 for 时则表示某事对某人而言如何，语义不通。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
刻薄的话
She made an unkind remark about his clothes.
她对他的穿着说了句刻薄的话。
对…不友善
He was unkind to his classmates.
他对同学不友善。
不友善的行为
We should not tolerate unkind behavior.
我们不应容忍不友善的行为。
冷酷的对待
The unkind treatment of refugees was widely criticized.
对难民冷酷的对待受到了广泛批评。
刻薄的玩笑
He made an unkind joke about her accent.
他拿她的口音开了个刻薄的玩笑。
最残忍的一击；最伤人的背叛
After all I did for him, his harsh criticism was the unkindest cut of all.
我为他做了那么多，他尖刻的批评是最伤人的打击。
这是最无情的一击。
In Julius Caesar, Antony describes Brutus's stab as 'the most unkindest cut of all' because it was a betrayal by a friend.
在《尤利乌斯·凯撒》中，安东尼将布鲁图斯的刺杀称为“最无情的一击”，因为那是朋友的背叛。
Use unkinder naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆：un- 意为“不”，kind 是“友善”，所以 unkind 就是不友善、刻薄。
语域：neutral 常见场景：日常对话、书面文章 “unkind” 通常属于中性词，在日常口语和书面语中都比较常见，多用于评价不友善、缺乏善意的言行；语气一般不算强烈。
这些词都以 -ind 结尾，读 /aɪnd/，与 unkind 结尾的 /kaɪnd/ 押韵。注意 wind 有例外：作名词“风”时读 /wɪnd/，不押韵；作动词“缠绕”时读 /waɪnd/，才押韵。不要凭拼写把 -ind 一律读成 /ɪnd/。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.