SLACKNESS

Yes, SLACKNESS is a Scrabble word!

Letter values in Scrabble US: S 1, L 1, A 1, C 3, K 5, N 1, E 1, S 1, S 1.S 1 · L 1 · A 1 · C 3 · K 5 · N 1 · E 1 · S 1 · S 1

Is it a valid word?

• Scrabble US: valid, 15 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 15 points
• Scrabble UK: valid, 15 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 15 points
• Words with Friends: valid, 18 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 18 points