1. [adj]  marked by wide-ranging knowledge and appreciation of many parts of the world arising from urban life and wide travel; "the sophisticated manners of a true cosmopolite"; "urbane and pliant...he was at ease even in the drawing rooms of Paris"
2. [adj]  characterized by tact and propriety
3. [adj]  showing a high degree of refinement and the assurance that comes from wide social experience; "his polished manner"; "maintained an urbane tone in his letters"

URBANE is a 6 letter word that starts with U.