I. adjective 1. sudden and unexpected • I was surprised by the abrupt change of subject
• the match came to an abrupt end.
2. brief to the point of rudeness; curt • you were rather abrupt with that young man.
3. (of a style of speech or writing) not flowing smoothly; disjointed. • abrupt, epigrammatic paragraphs.
• an occasionally abrupt narrative.
4. steep; precipitous • the abrupt double peak.
II. derivatives abruptness /əˈbrʌptnəs / noun
– origin late 16th cent.: from Latin abruptus ‘broken off, steep’, past participle of abrumpere, from ab- ‘away, from’ + rumpere ‘break’.