As an inexperienced driver, he was nervous on the highway.

inexperienced 是由前缀 in-（表示“不、无”）和形容词 experienced（有经验的）组成的复合词。experienced 来自名词 experience（经验）加上后缀 -ed 变成形容词。 inexperienced 字面意思是“没有经验的”，即“缺乏经验的”。