Is “Blithest” a Scrabble word?
Yes
BLITHEST
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 Blithest
adjective
1.(dated or literary) Happy, cheerful.
2.Casually indifferent, careless, showing a lack of concern.
“She had a blithe disregard of cultures outside the United States.”