Nice way to express boredom? (5)

I believe the answer is:

ennui

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'boredom?' is the definition.
(I know that boredom can be written as ennui)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ennui that I've seen before include "depression" , "Listless feeling" , "Boredom in France" , "Weary feeling" , "Bored listlessness" .)

I've seen this clue in The Telegraph.

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