The phrase "left uncompleted" is grammatically correct and can be used in written English.
It is typically used to describe a situation where something is not finished or remains unfinished. Example: The construction project was left uncompleted due to budget constraints.
The one exception was his embryonic version of "Original of Laura," which was left uncompleted after Nabokov's death, and which he had instructed his widow, Vera, to destroy.
After the closing ceremony there was a 24-hour window to finish any events that had been left uncompleted.
Following his exposure of racism in Invisible Man, a sequel, Juneteenth, was left uncompleted at his death in 1994.
San Lorenzo, early Renaissance-style church designed by Brunelleschi and constructed in Florence from 1421 to the 1460s, except for the facade, which was left uncompleted.
He sometimes suggested that he might stop writing, but never really meant it, and at his death left uncompleted yet another novel.
Wilson edited the posthumous papers and notebooks of his college friend F. Scott Fitzgerald, The Crack-Up (1945), and also edited the novel The Last Tycoon (1941), which Fitzgerald had left uncompleted at his death.
As he lay dying he rued the many projects that he was going to leave uncompleted.
When he died, his last composition, a viola concerto, was left an uncompleted mass of sketches (completed by Tibor Serly, 1945).
*Questionnaires were excluded if students left items uncompleted and a total component score could not be calculated.
Many "condo-hotels," in which a company manages a hotel with individually owned units, were left unsold or uncompleted.
News that David Foster Wallace, who killed himself last September, left behind an uncompleted novel is of course exciting.
