Definitions

1. adjective

the most fluent or eloquent in speaking, but lacking sincerity or genuine emotion

“He was considered the glibbest among his group of debaters, but his lack of conviction often hurt his arguments.”

2. noun

the most fluent or eloquent person in speaking, but lacking sincerity or genuine emotion

“The glibbest speaker of the night was a well-known politician who often made empty promises.”