Is “Briefest” a Scrabble word?
Yes
BRIEFEST
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 Briefest
adjective
1.Of short duration; happening quickly.
“Her reign was brief but spectacular.”
2.Concise; taking few words.
“His speech of acceptance was brief but moving.”
3.Occupying a small distance, area or spatial extent; short.
“Her skirt was extremely brief but doubtless cool.”