Glibly

6 clues
With fluency
Easily and fluently
With a silver tongue
How fast-talkers talk
In a slick-talking manner
With superficial plausibility
Similar answers:
Ably
Admirably
Adorably
Affably
Agli
Aglimmer
Aglines
Aglint
Aglio
Aglioeolio
Aglisten
Aglit
Aglitter
Agreeably
Alfredstieglitz
Allthatglistersisnotau
Allthatglitters
Alonglittledogie
Amenably
Americanenglish