honey-mouthed

adjective2

1. •
   (in a positive sense) Having a sweet and smooth voice; eloquent.
2. •
   (in a negative sense) Indirect, delivering a message in a way that will make it seem more pleasant to the hearer(s); seductive, persuasive.

   • Now to thintent thou mayest playnly beholde and Iudge rightly of these hony mouthed false feynyng flatterours and auncient enemyes of Christes religion the better and more readily […] — 1553