He's a man of few words, very polite and unassuming.

他不爱说话，非常有礼貌，也不装腔作势。

《柯林斯英汉双解大词典》

Holding the door open is a polite and thoughtful act.

为客人开门是一种礼貌周到的行为。

youdao

Gonzales, a quiet and very polite young man, made a favourable impression.

冈萨雷斯是个文静而又很有礼貌的年轻人，给人留下了很好的印象。

《柯林斯英汉双解大词典》

He carried messages for them. He brought them their programs with a polite bow.

VOA: special.2009.04.04

it's more indirect, more polite and a little bit less abrasive perhaps.

这样来得更委婉、有礼貌，也相对不会伤人感情。

Would you please 课堂 - SpeakingMax英语口语达人

You will say it in a polite way. In a way that doesn't put people off or upset them.

这样你会以一种更礼貌的方式来提起一个话题。这样的说法不会引起人们的不快或气愤。

I'd better 课堂 - SpeakingMax英语口语达人

It would seem obvious that a new building should offer something more challenging than a polite bow to a distinguished past.

WSJ: Cooper Union's New Building, at 41 Cooper Square | By WSJ Architecture Critic Ada Louis Huxtable

But the king, knowing this is a polite way of phrasing a republican ambition, will not.

ECONOMIST: King, politicians and Maoists fiddle while Nepal burns

Lately, when I tell stories of folks who have built great things over the course of a long career, or who have had remarkable success in a second (or third) career later in life, the reaction is often polite and a little bored.

FORBES: Start Doing What You Most Want To Do, Right Now.