Wiktionary
flannel-mouthed
a. 1 Possessing, characterized by, or in the manner of speaking of a flannelmouth. 2 # smooth and persuasive in speech, especially in order to deceive or manipulate. 3 # unclear, muffled, or halting in speech. alt. 1 Possessing, characterized by, or in the manner of speaking of a flannelmouth. 2 # smooth and persuasive in speech, especially in order to deceive or manipulate. 3 # unclear, muffled, or halting in speech.