不苟言笑的英文：
[Literal Meaning]
not/imprudent/speak/laugh.
not to speak and laugh imprudently

[解释]
态度庄重、严肃。

[Explanation]
to be discreet in speech and manner

[例子]
在孩子面前，父亲总是不苟言笑，显得很严肃。

[Example]
The father was always keep a straight face and looked serious before his kids.

[英文等价词]
to keep a straight face

参考例句：
  • He keeps his gravity all along.
    他一向不苟言笑。

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