EFFICACIOUSLY

Yes, EFFICACIOUSLY is a Scrabble word!

Letter values in Scrabble US: E 1, F 4, F 4, I 1, C 3, A 1, C 3, I 1, O 1, U 1, S 1, L 1, Y 4.E 1 · F 4 · F 4 · I 1 · C 3 · A 1 · C 3 · I 1 · O 1 · U 1 · S 1 · L 1 · Y 4

Is it a valid word?

• Scrabble US: valid, 26 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 26 points
• Scrabble UK: valid, 26 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 26 points
• Words with Friends: valid, 29 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 29 points