Crossword Genius

The blahs, more formally

Ross

I believe the answer is:

ennui

(Other definitions for ennui that I've seen before include "Boredom or discontent" , "The feeling of being bored" , "Feeling of listlessness" , "Feeling when tired of life?" , "Boredom, tedium" .)

I've seen this clue in The New York Times.
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