Definition of ennui noun from the Oxford Advanced Learner's Dictionary

 

ennui

 noun
noun
BrE BrE//ɒnˈwiː//
 
; NAmE NAmE//ɑːnˈwiː//
 
[uncountable](from French, literary)
 
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feelings of being bored and not satisfied because nothing interesting is happening Word Origin mid 18th cent.: French, from Latin in odio(n-), from mihi in odio est ‘it is hateful to me’. Compare with annoy.
See the Oxford Advanced American Dictionary entry: ennui