dull

The speaker's voice was so dull that half the audience fell asleep.

(Chinese) 演讲者的声音太乏味了，一半的听众都睡着了。

Life in the small village felt dull after years of living in the city.

(Chinese) 在城市生活多年后，小村庄的生活显得很枯燥。

The chef struggled to cut the meat with a dull knife.

(Chinese) 厨师费力地用一把钝刀切肉。

The silver coins became dull after being buried in the soil for centuries.

(Chinese) 这些银币在土里埋了几个世纪后变得失去了光泽。