Adjective
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surprisingly and unceremoniously brusque in manner
"an abrupt reply"
-
extremely steep
"an abrupt canyon"
"the precipitous rapids of the upper river"
"the precipitous hills of Chinese paintings"
"a sharp drop"
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exceedingly sudden and unexpected
"came to an abrupt stop"
"an abrupt change in the weather"
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marked by sudden changes in subject and sharp transitions
"abrupt prose"