The phrase "abruptly different" is correct and usable in written English.
It can be used to describe a sudden and noticeable change in something, often in a context where the difference is striking or unexpected.
Example: "The weather was abruptly different when we arrived in the mountains, shifting from sunny to snowy in just a few hours."
Alternatives: "suddenly distinct" or "sharply contrasting".
The book's "Soldier" section is as abruptly different on the page as Captain Mullaney's wartime experience must have been in life.
It consists of a regression model incorporating a discrete hidden logistic process allowing for activating smoothly or abruptly different polynomial regression models.
But there has also been a trend toward writing of personal emotional matters, and increasing emphasis -- abruptly different from the classical world -- on writing one's own songs, and Mr. Sear has not been drawn in either of these directions.
After one character sets up the ending, abruptly cut to a different panel where things end.
South of the Adirondack Mountains and the Superior Upland lies the boundary between crystalline and sedimentary rocks; abruptly, everything is different.
Halfway into the Haikou morning practice, in the first full-court scrimmage, Chen Jianghua abruptly became a different player: demonstrative, alert, in his element.
Mr. Lennon's next film, tentatively titled "The End," will involve another protagonist thrust abruptly into a different class and social position.
He abruptly intercuts the different musical sources throughout the film, following a scene with drone-like chanting and two women's incantation of a naïvely metaphysical meditation with one of Coleman's catchiest blues jaunts.
But with Burnham's transformation, Mendes's picture abruptly moves to a different level, rich and rounded and graceful.
Instead, the strain path is abruptly changed to a different strain increment ratio and the material undergoes continuous loading until the forming limit is reached.
On Saturday the set — 24 planks that loudly shift into different configurations — abruptly halted as it rotated into the wide, tilting staircase that the gods Wotan and Loge use to descend into Nibelheim.
