He refuses to listen to any opinions that differ from his own, being so close-minded.

close-minded 是由形容词 close（封闭的）和名词 mind（思想、头脑）组成的复合形容词，加上后缀 -ed 表示"具有...特征的"。字面意思是"思想封闭的"，引申为"固执的、不愿接受新观念的"。