abruptness
a-brupt-ness
noun
The quality of being sudden, unexpected, or impolite in manner.
"Her abruptness surprised everyone."
Thesaurus
Synonyms: brusqueness, gruffness, curtness, shortness, precipitance, suddenness, precipitateness, precipitousness, precipitancy, steepness
Antonyms: gentleness, gradualness