For the French-ness of it.
For the fact that it's mostly vowels.
For knowing that this wee little word has a whole world of boredom wrapped up inside it. Ennui can be anything from leaning out over a black hole at a kooky and treacherous angle, to simply lacking the slight motivation to go and gather a bounteous bouquet of lilies when the lilies are growing like stars in the sky right alongside one's own kitchen porch.
And if not lilies, then something from that glorious yielding-up of yellow that is the...hmm, what is this yellow flower, Viewer Dear?!
make up a pink bouquet...
......or cut a cluster of roses from the masses.