Blunt, perhaps, 8 letters
Churlish, 8 letters
Discourteous, 8 letters
Ill-mannered, 8 letters
Q: Do people find you rude? A: No. ___, 8 letters
Rude, 8 letters
Unmannerly, 8 letters
How boors behave, 10 letters
Hardly tactful, 9 letters
A discourteous manner that ignores accepted social usage, 12 letters