We'll break it to you gently: abrupt derives from abruptus, the past participle of the Latin verb abrumpere, meaning "to break off." Abrumpere combines the prefix ab- with rumpere, which means "to break" and which forms the basis for several other words in English that suggest a kind of breaking, such as interrupt, rupture, and bankrupt. Whether being used to describe a style of speaking that seems rudely short (as in "gave an abrupt answer"), something with a severe rise or drop ("abrupt temperature change"), or something that seems rash and unprecipitated ("made the abrupt decision to quit college"), abrupt, which first appeared in English in the 16th century, implies a kind of jarring unexpectedness that catches people off guard.
There was an abrupt change in the weather. The road came to an abrupt end. The storm caused an abrupt power failure. She has an abrupt manner.
Recent Examples on the WebWallis Simpson, the woman whose fate altered Elizabeth’s destiny, wrote of being unprepared for Edward’s abrupt rejection by an establishment that had put him on a pedestal. Adrian Higgins, Washington Post, 8 Sep. 2022 The spectacularly volatile compound of place and moment was exploding into galaxies of potentialities that invited psychological exploration, social experimentation, abrupt life transitions, and exuberant or desperate adventure. Deborah Eisenberg, The New York Review of Books, 7 Sep. 2022 The latter interest leads him to develop new friendships with local music students, compounding Pádraic’s abrupt isolation. David Rooney, The Hollywood Reporter, 5 Sep. 2022 If not, the resulting damage could lead to an abrupt engine shutdown and aborted flight. Denise Chow, NBC News, 3 Sep. 2022 If not, the resulting damage could lead to an abrupt engine shutdown and aborted flight. Marcia Dunn, Chron, 3 Sep. 2022 If not, the resulting damage could lead to an abrupt engine shutdown and aborted flight. Marcia Dunn, Chicago Tribune, 3 Sep. 2022 Barbie's abrupt exit followed a pre-existing backlash surrounding Hunter Schafer, who plays Jules, another leading character on the show. Francesca Specter, Glamour, 1 Sep. 2022 The abrupt transition to remote work was smoother than adapting to the current reality, in which some people stay home and others schlep back to the office. Ben Cohen, WSJ, 1 Sep. 2022 See More
Word History
Etymology
borrowed from Latin abruptus "steep, sheer, broken or cut off too short," from past participle of abrumpere "to break, rupture, break off short," from ab-ab- + rumpere "to cause to break or burst," going back to Indo-European *ru-n-p-, nasal present formation from the base *reu̯p- "break, tear" — more at reave