A previously unpublished poem by Sylvia Plath is online at Blackbird. You can see the facsimile of her final draft. She wrote Ennui while a student at Smith. Check it out.
Karen Kukil, editor of The Unabridged Journals of Sylvia Plath, is quoted in a Smith newsletter saying,
"It is difficult to realize how hard Plath worked to perfect her craft unless you read the poems written before 1956; many of these poems, like 'Ennui,' deserve publication."