Is “Quieten” a Scrabble word?
Yes
QUIETEN
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 Quieten
/ˈkwaɪ.ə.tən/
verb
1.To make quiet.
2.To become quiet.