Is “Mumbled” a Scrabble word?
Yes
MUMBLED
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Mumbled
verb
1.To speak unintelligibly or inaudibly; to fail to articulate.
“Please try not to mumble so I can hear you better.”
2.To chew something gently with closed lips.