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WordNet (r) 3.0 (2006) (WordNet)

abruptness
n 1: an abrupt discourteous manner [synonym: {abruptness},
{brusqueness}, {curtness}, {gruffness}, {shortness}]
2: the property possessed by a slope that is very steep [synonym:
{abruptness}, {precipitousness}, {steepness}] [ant:
{gentleness}, {gradualness}]
3: the quality of happening with headlong haste or without
warning [synonym: {abruptness}, {precipitateness},
{precipitousness}, {precipitance}, {precipitancy},
{suddenness}]