“表情的”的英语可以翻译为：expressional ...

他偷偷地瞄了一下两名侦探面无表情的脸孔。He glanced furtively at the stolid faces of the two detectives.那张毫无表情的脸看上去深沉而又神秘。That expressionless face had seemed deep and mysterious.她有一双极富表情的眼睛。She has wonderfully expressive eyes....