Noun
The state of being abrupt or broken; craggedness; ruggedness; steepness.
Suddenness; unceremonious haste or vehemence; as, abruptness of style or manner.
Source: Webster's dictionaryIn addition to the Younger, Older, and Oldest dryases, a century-long period of colder climate similar to the Younger Dryas in abruptness has occurred within both the Bølling oscillation and the Allerød oscillation interstadials. Source: Internet
G. Kennedy, "Oratory", 519. Demosthenes was apt at combining abruptness with the extended period, brevity with breadth. Source: Internet