Wiktionary
boxiness
n. The condition of being boxy
Usage examples of "boxiness".
His lips were chiseled but a little too thin, his jaw strong but with a crude boxiness at the angle of the bones.
She looked deuced odd with just the one mast instead of two, but her hull was shapely: none of the boxiness of a ship o' war.
A coach hung in its vacuum, boxiness relieved by vivid hues and broad windows.