well spoken
adjective approving uk/ˌwel ˈspəʊ.kən/ us/ˌwel ˈspoʊ.kən/
（人）善于辞令的;谈吐文雅的;说话得体的
having a pleasant and polite way of speaking that is considered socially acceptable
The young man was well spoken and polite. 这个年轻人言语得体，也很有礼貌。