Yes, LAWLESSNESS is a Scrabble word!

Letter values in Scrabble US: L 1, A 1, W 4, L 1, E 1, S 1, S 1, N 1, E 1, S 1, S 1.

Is it a valid word?

LAWLESSNESS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a state of lawlessness and disorder (usually resulting from a failure of government)
illegality as a consequence of unlawful acts; defiance of the law