Definition of abrupt
1a
: characterized by or involving action or change without preparation or warning : sudden and unexpected
came to an abrupt stop an abrupt turn an abrupt decision to retire
b
: rudely or unceremoniously curt
She has an abrupt manner. an abrupt reply
c
: lacking smoothness or continuity
an abrupt transition
2
: giving the impression of being cut or broken off
especially
: involving a sudden steep rise or drop
abrupt hills a high abrupt bank bounded the stream
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Merriam-Webster unabridged
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Time Traveler for abrupt
The first known use of abrupt was in 1576
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