Long-term malnutrition left him looking skull-faced and gaunt.

skull-faced 是由名词 skull（头骨）和形容词 faced（有...面容的）组成的复合形容词，字面意思是"有头骨面容的"。 skull 指"头骨、骷髅"，faced 来自 face（脸）加后缀 -ed，表示"有...面容的"。 skull-faced 形容人瘦得皮包骨头，面容凹陷如同骷髅一般。