Ennui (6)
'ennui' is the definition.
(I know that ennui can be written as tedium)
This is all the clue.
(Other definitions for tedium that I've seen before include "Boredom, mental weariness" , "'Boredom, ennui (6)'" , "Dullness, monotony" , "Routine" , "Boredom or dullness" .)
'ennui' is the definition.
(I know that ennui can be written as boredom)
This is the entire clue.
(Other definitions for boredom that I've seen before include "weary idleness" , "Overseers" , "Mental state" , "Tedium, ennui" , "Ennui in bedroom" .)