不苟言笑是指不随便说笑。形容态度庄重严肃。

出自《礼记·典礼上》：“不苟訾，不苟笑。

那么不苟言笑用英语怎么说？

不苟言笑可以用serious in speech and manner，keep one's gravity，not frivolous in talking and joking等来表示，例如：

1.面试官是那种不苟言笑的类型，不过我敢说我的回答很合他意。
The interviewer was of the serious, taciturn type, but I could tell the answer registered. 

2.（不苟言笑的）旗帜周刊正在出售一个奥巴马总统模样的橡皮头以供人们挤压著玩，在他们对他感到愤怒的时候。
The (Very Serious) Weekly Standard is marketing a rubber head likeness of President Obama designed for people to squeeze whenever they're pissed off at him. 

3.这给一向不苟言笑的卡瑞尔一个要扮演的完美的选择。
Which makes Carell, master of the awkward laugh, a perfect choice to play the lead. 

4.比我想象的要小，围绕高处的一间诵经堂，有一群整洁的白色房子。 一位不苟言笑的年轻女人带我到诵经堂，她穿着红色袍子，留着平头。
It is smaller than I’d imagined, a huddle of neat, white-walled buildings arranged around a tall prayer-hall, which an unsmiling young woman, with the obligatory red robe and crew cut, leads me to. 

5.汤姆森多才多艺，尤以数学和天文学上的成就著称。 出生于爱尔兰的汤姆森身材高大、不苟言笑、面容消瘦、目光敏锐。
A well-rounded man, known for his work in astronomy and mathematics, the Irish-born Thomson was a tall, austere figure with a narrow face and keenly penetrating eyes.

你可能还想知道：不动声色用英语怎么说？