Wiktionary
vb. (context linguistics transitive English) To change (a vowel) so that it is no longer round.
Usage examples of "unround".
Another of his senses registered, brown eyes, pale skin, pink lips, and a strange unround body that looked somehow proper on those long, straight legs.
No one has ever been left unround, and when they are returned to civilization, they are taken to the Heavenly Court.
But the thing was still hopping crazily about, the way an unround and pointed ball was apt to do, as if it were a faithful representative of its crazy period of history, and it bounced off the Citizen’s knee.
He was dark-complected and rough-skinned, and as with most fit middle-aged men, his face was unrounded by fat, more distinguished than pleasant.
His accent was clear, unrounded, not native to these parts, and he spoke English with a clarity and ease that was as surprising as it had been unexpected.
The I arrested their attention was hundreds of the smaller s, standing--long necks curved into an S and long beaks lab at fish--on nearly every single one of the sturdy lily unrounded each fragrant blooming white flower.