1) Brevity 2) Brusqueness 3) Curtness 4) Discourtesy 5) Gruffness 6) Rapidity 7) Rudeness 8) Shortness 9) Speed 10) Swiftness 11) Unexpectedness 
• (n.) The state of being abrupt or broken; craggedness; ruggedness; steepness. • (n.) Suddenness; unceremonious haste or vehemence; as, abruptness of style or manner.
Ab·rupt'ness noun 1. The state of being abrupt or broken; craggedness; ruggedness; steepness. 2. Suddenness; unceremonious haste or vehemence; as, abruptness of style or manner. 
[n] - the property possessed by a slope that is very steep 2. [n] - the quality of happening with headlong haste or without warning 3. [n] - an abrupt discourteous manner
abruptness 1. Suddenness; unceremonious haste or vehemence; as, abruptness of style or manner. 2. The state of being abrupt or broken; craggedness; ruggedness; steepness.
steepness noun the property possessed by a slope that is very steepprecipitateness noun the quality of happening with headlong haste or without warning
the quality of happening without warning