boring

无聊的、乏味的、枯燥的

The lecture was so boring that half the students fell asleep.

那场演讲太无聊了，一半的学生都睡著了。

单调的、平淡无趣的

He wears the same boring gray suit to every meeting.

他每次开会都穿同一套单调的灰色西装。

钻孔、钻探专业用语

The boring of the tunnel took nearly three years to finish.

这条隧道的钻掘工程花了将近三年才完成。