Typically used as an uncountable abstract noun; rarely countable to denote specific awkward acts.
His ungracefulness on the dance floor was obvious to everyone.
Его неграциозность на танцполе была очевидна всем.
The ungracefulness of her stumble made the audience gasp.
Неуклюжесть её спотыкания заставила публику ахнуть.