情愫的英文：
[Formal] sincerity; sincere feeling

参考例句：

Her kindness made him regard her with renewed affection.
她十分体贴,使他对她重生情愫.

I insinuate to her a thousand hints, which, as she is perfectly spiritual, she receives
我已把我的情愫千百次灌注到她的心头，她既是完美精神的化身，就能理解我的心意。

formal是什么意思：
adj. 正式的；礼仪上的；有条理的；正规的；公开的 ；拘谨的

You should recast the report in formal wording as it is a formal occasion.
这是一个很郑重的场合，所以你的报告应改的正式一点。

A formal note is essentially a formal personal letter.
正式照会实质上是正式的个人函件。

They are very formal in their business transactions.
他们的商务议事很有条理。

sincerity是什么意思：
n. 诚挚

She‘s a sincere friend.
她是位忠实的朋友。

His sincereness moved me.
他的真诚打动了我。

Misfortune tests the sincerity of friends
患难见真情.

sincere是什么意思：
adj. 真诚的，衷心的；诚恳的；诚实的，忠实的；正直的

She‘s a sincere friend.
她是位忠实的朋友。

His sincereness moved me.
他的真诚打动了我。

Misfortune tests the sincerity of friends
患难见真情.