imˈpartialnessrare. [f. as prec. +-ness.] The quality of being impartial; impartiality. 1643W. Greenhill Axe at Root 25 You see the severity of God in his impartiallnesse towards every tree.1675Temple Let. to Chas. II 29 Jan., Wks. 1720 II. 322 A Thing that would give him Assurance of Your Majesty's Impartialness.