C2 noun /ˈɒnwiː/ or /ˈɑːnwiː/
ennui
Langeweile
Meaning
A feeling of boredom, listlessness, or dissatisfaction arising from lack of excitement.
Example
After weeks of doing nothing, he sank into a deep sense of ennui.
Nach Wochen ohne etwas zu tun, verfiel er in tiefe Langeweile.