ABRUPT

• Brusque

• Brusque in manner

• Curt

• Discourteously curt

• Exceedingly sudden

• Hasty

• Precipitate

• Precipitous

• Rather sudden

• Short

• Short-spoken

• Short, but not necessarily sweet

• Steeply inclined

• Sudden

• Surprisingly curt

• Unceremonious

• Unceremoniously curt

• Unexpected

• Without warning