From Longman Dictionary of Contemporary Englishsmooth-talkingˈsmooth-ˌtalking adjective PERSUADEa smooth-talking person is good at persuading people and saying nice things, but you do not trust them a smooth-talking salesman
Examples from the Corpus
smooth-talking• a smooth-talking car salesman• A smooth-talking charmer who helped women with their health problems.• A smooth-talking young man was offering to buy her a drink. 