认真的的英文：
demure
douce
sadd
serious
serious-minded
seriousminded
staid

参考例句：

Eleanor was brusque and firm and businesslike.
埃莉诺态度粗暴，意志坚定、办事认真。

We'll get to grips with the problem very soon
我们将会很快认真处理这个问题。

He carefully read the proceedings from last meeting.
他认真阅读了上次会议的记录。

My son' s reaction to the letter was somewhat indifferent.
我儿子并不认真把这封信当回事。

He did his best, therefore, to achieve a mood half sportive and half thoughtful'
于是他尽其所能培养一种半开玩笑半认真的心情。

Take .. seriously; take .. for serious
对..认真

Intense study
认真的研究

I mean it. I'm serious. I'm no kidding!
我是认真的

Be assiduous in one's duties
认真执行任务

I' m in deadly earnest.
我是非常认真的.

demure是什么意思：
a. 故作端庄的；假正经的；娴静的；庄重的；严肃的

It would seem hazardous to demur at(to)a proposition which is so widely accepted
对一项如此广泛地接受的建议表示反对似乎是危险的。

In the end Nixon accepted our unanimous advice without demur
最后尼克松接受了我们一致的忠告，没有表示任何异议。

They were so thrilled and delighted that they flung away any pretence of being demure young ladies and rushed out of the house
她们惊喜若狂，因此一扫少女往常的矜持，冲出屋子。

douce是什么意思：
a. 沉着的,认真的,稳静的
sadd是什么意思：
a. 悲哀的;拙劣的;暗晦的;认真的