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out of politeness
out of politeness 是固定介词短语，意为“出于礼貌”，在句中作状语。
She smiled out of politeness, not because she was amused.
她出于礼貌笑了笑，并不是因为觉得好笑。
礼貌；客气；有礼
先理解核心含义，再看它在真实句子里的用法。
礼貌；客气；有礼
a courteous manner that respects accepted social usage
She smiled out of politeness, not because she was amused.
她出于礼貌笑了笑，并不是因为觉得好笑。
礼貌的品质；礼貌。
The quality of being polite.
礼貌的行为
A polite act.
Her politeness made a good impression on the guests.
她的礼貌给客人们留下了好印象。
He thanked the waiter with genuine politeness.
他真诚而礼貌地感谢了服务员。
Politeness costs nothing but can open many doors.
礼貌不费分文，却能打开许多扇门。
out of politeness 是固定介词短语，意为“出于礼貌”，在句中作状语。
She smiled out of politeness, not because she was amused.
她出于礼貌笑了笑，并不是因为觉得好笑。
have the politeness to do sth 后接不定式，常用于否定句或疑问句，表示“连……的礼貌都没有”。
He didn't even have the politeness to thank me.
他甚至没有向我道谢的礼貌。
show politeness to/towards sb 中，to 与 towards 同义，都可引出礼貌的对象；politeness 通常作不可数名词。
We should always show politeness to our guests.
我们应该始终对客人表示礼貌。
Not this
You should be politeness to your teachers.
Use this
You should be polite to your teachers.
polite 是形容词，意为‘有礼貌的’，用在 be 动词后作表语；politeness 是名词，意为‘礼貌’，不能作表语。中文的‘对老师有礼貌’在英语中要用 be polite to，而不是 be politeness to。
Not this
He has good politeness.
Use this
He has good manners.
表示‘有礼貌、有教养’时，英语习惯说 have good manners，不使用 have good politeness；politeness 是抽象名词，常用于 show politeness 或 treat somebody with politeness，但不能与 good 搭配表示人的品性。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
出于礼貌
She smiled out of politeness, even though she felt annoyed.
她出于礼貌笑了笑，尽管她心里很烦。
基本的礼貌；通常的客气
It's common politeness to hold the door for the person behind you.
为身后的人扶住门是基本的礼貌。
互相寒暄；彼此说客套话
They exchanged politenesses before discussing the contract.
他们先客套了一番，然后才开始谈合同。
礼貌的表示；客气的姿态
Her smile was a show of politeness rather than real warmth.
她的微笑只是出于礼貌，并非真的热情。
故作礼貌；刻意表现出的客气
She treated him with studied politeness, hiding her dislike.
她对他故意表现得客客气气，掩饰自己的反感。
过分的礼貌；过于客气
His excessive politeness made the guests feel uneasy.
他过分的礼貌让客人们感到不自在。
礼貌不用花钱；礼貌不费分文
Go on, say thank you—politeness costs nothing.
快去说声谢谢——礼貌又不花钱。
出于礼貌
She smiled out of politeness, not because she was amused.
她出于礼貌笑了笑，并不是觉得好笑。
为了礼貌起见
He asked about her weekend for politeness's sake.
他出于礼貌问了问她周末过得怎么样。
礼貌，名词：最容易被人接受的虚伪。——安布罗斯·比尔斯《魔鬼辞典》
Bierce's wit still rings true: politeness can be a way of hiding true feelings.
比尔斯的妙语至今依然成立：礼貌可能是掩饰真实感受的一种方式。
礼貌是协作的毒药。——埃德温·兰德（宝丽来创始人）
In brainstorming, excessive politeness may keep teams from challenging weak ideas.
在头脑风暴中，过度的礼貌可能让团队不敢质疑糟糕的想法。
Use politeness naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想记忆：polite（有礼貌的）＋ ness（名词后缀）＝ politeness。想象在伦敦地铁对陌生人微笑说 please 和 thank you，那种客气就是 politeness。
语域：neutral 常见场景：日常社交、职场交流、正式书面语 该词为中性常用词，多用于描述人际交往中的礼貌行为，在正式写作和日常口语中都比较常见。
表示‘礼貌’这一品质时通常不用复数；复数 politenesses 仅指具体的礼貌行为或言辞。
Dictionary facts from ECDICT, WIKTIONARY.