ennui
n[U]
weariness of mind caused by lack of anything interesting or exciting to do; feeling of boredom 倦怠; 无聊
Since losing his job, he has often experienced a profound sense of ennui. 他自从失业以来, 常觉百无聊赖.
To love and to be loved is the greatest happiness of existence.
爱人和得到人爱是人生最大的幸福。
Winter was coming on and the hills threatened the surrounding villages with destruction, for heavy rain would not only wash away the soil but would cause serious floods as well.