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Synonyms for Abrupt (same or very similar meaning)

WordNet sense 1 ((music) marked by or composed of disconnected parts or sounds; cut short crisply):
disconnected, staccato

WordNet sense 2 (extremely steep):
precipitous, sharp

WordNet sense 3 (having a sharp inclination):

WordNet sense 4 (happening without warning or in a short space of time):

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