Is “Nastier” a Scrabble word?
Yes
NASTIER
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Nastier
adjective
1.Dirty, filthy.
2.Contemptible, unpleasant (of a person).
3.Objectionable, unpleasant (of a thing); repellent, offensive.