Definition of Ennui: Ennui (noun): A feeling of listlessness and dissatisfaction arising from a lack of occupation or excitement; boredom. Synonyms: boredom, lethargy, tedium, weariness Antonyms: excitement, enthusiasm, energy, interest Memory Tip: Think of “ennui” as that deep, heavy sense of boredom that sets in when nothing around you feels engaging or worthwhile. Conversation and…