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Definition: a feeling of listlessness and dissatisfaction arising from a lack of occupation or excitement

Examples

1. After weeks of doing nothing during the summer holidays, Jacob felt a deep sense of ennui.
2. The relentless monotony of his daily routine brought about a pervasive ennui he found hard to shake off.
3. As the meeting dragged on for hours, ennui settled over the room like a heavy fog.