His rough-hewn sense of humor seemed out of place at the formal dinner party.

rough-hewn 是由形容词 rough（粗糙的）和动词 hew（砍、劈）的过去分词 hewn 组成的复合形容词。hew 本意是用工具砍劈木材或石头，rough-hewn 字面意思是"粗砍出来的"，引申为"未经雕琢的""粗犷的"。