poker-faced
adj. 沒有表情的,一本正經的; 面無表情
If you are poker-faced, you have a calm expression on your face which shows none of your thoughts or feelings.
His expressions varied from poker-faced to blank...
他的表情在一本正經和茫然惶惑之間變幻不定。
The officer listened, poker-faced.
那個官員面無表情地聽著。
1. deliberately impassive in manner;