看到他疲惫焦虑的面容，我意识到他最近压力很大。

His careworn expression made me realize how much stress he's been under lately.

careworn 是由 care（忧虑、操心）和 worn（wear 的过去分词，表示"磨损的、疲惫的"）组成的复合形容词，字面意思是"被忧虑磨损的"，形容因长期忧虑而显得疲惫憔悴的面容或神情。