Is “Overwhelmingly” a Scrabble word?
Yes
OVERWHELMINGLY
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 Overwhelmingly
adverb
1.In an overwhelming manner; very greatly or intensely.