ennui, lack of interest, weariness, world-weariness, taedium vitae (Latin), tedium, tiresomeness, apathy, wearisomeness, doldrums, listlessness, irksomeness, the blahs*; see also dullness 1, indifference 1, monotony.
"boredom." YourDictionary, n.d. Web. 06 June 2018. <http://thesaurus.yourdictionary.com/boredom>.
boredom. (n.d.). Retrieved June 06th, 2018, from http://thesaurus.yourdictionary.com/boredom
The condition of being bored: