Defined….

en·nui

änˈwē/

noun

1 a feeling of listlessness and dissatisfaction arising from a lack of occupation or excitement.

synonyms:

boredom, tedium, listlessness, lethargy, lassitude, languor, weariness, enervation; malaise, dissatisfaction, melancholy, depression, world-weariness, Weltschmerz “an ennui bred of long familiarity”