Early autumn night, coolness deeper and deeper, and walking alone in the autumn wind howling on the streets, watching people hurry around, face expressionless!

初秋的夜，凉意越来越深了，独自走在秋风瑟瑟的大街上，看身边的人行色匆匆，面无表情！

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His face had become peculiarly expressionless.

他的脸变得异乎寻常地毫无表情。

《柯林斯英汉双解大词典》

His face was expressionless, but Alex felt the unspoken criticism.

他面无表情，但亚历克斯感觉到了他无言的批评。

《柯林斯英汉双解大词典》

As he spoke of Baxter, of how he found out about the suicide, Skilling kept his face expressionless.

NPR: Skilling Takes Stand, Proclaims Innocence at Enron Trial

She recognized the bushy hair and the blue shirt, yet for a moment she willed her face to stay expressionless, hoping that Walter would think that he had waved at the wrong woman.

NEWYORKER: Alone

Most people have a blank, expressionless look on their face when listening to someone else talking.

FORBES: Smile For The Camera -Media Training