在英语中，可以用 "boring teacher" 或 "uninteresting teacher" 来描述一个无趣的老师。
这两个词的来源都是显然的，"boring" 意思是"令人厌烦的，乏味的"，而 "uninteresting" 则意思是 "不有趣的，没有吸引力的"。
下面是一些例句：
I can't stand my history teacher. He's so boring.
(我受不了我的历史老师。他太无趣了。)
My math teacher is uninteresting. I always fall asleep in his class.
(我的数学老师太无趣了。我总是在他的课上睡着。)
I wish I had a more engaging teacher. This one is just boring.
(我希望我有一个更有吸引力的老师。这个人太无趣了。)