CUMBROUSLY

Yes, CUMBROUSLY is a Scrabble word!

Letter values in Scrabble US: C 3, U 1, M 3, B 3, R 1, O 1, U 1, S 1, L 1, Y 4.C 3 · U 1 · M 3 · B 3 · R 1 · O 1 · U 1 · S 1 · L 1 · Y 4

Is it a valid word?

• Scrabble US: valid, 19 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 19 points
• Scrabble UK: valid, 19 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 19 points
• Words with Friends: valid, 24 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 24 points