Yes, BLUNTED is a Scrabble word!

Letter values in Scrabble US: B 3, L 1, U 1, N 1, T 1, E 1, D 2.

Is it a valid word?

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

make less intense
make numb or insensitive
make dull or blunt
make less sharp
make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation