stuffy的比較級是什么

　　例句：

　　Museums have been trying hard to shed their stuffy image.

　　博物館一直努力改變自己沉悶的形象。

　　It was hot and stuffy in the classroom.

　　教室里很悶熱。

　　That stuffy professor gives very boring lectures.

　　那個古板的教授講課無聊透頂。