Abruptly means with sudden sharpness, cutting things off mid-flow. The conversation stopped, and nobody had finished a sentence.
The word carries a hint of rudeness or alarm, which is what separates it from simply suddenly, since something done abruptly interrupts an expectation. It attaches to stopped, ended, left, turned and changed. Roads and paths do it too, and a track that ends abruptly leaves you standing in a field. The adjective abrupt describes manner as well as movement, and an abrupt reply is a curt one.
1adverbabruptlySuddenly and unexpectedly, breaking the flow.
“He stood up abruptly and left the room.”
Also accepted in games: suddenly
Proto-Indo-European
*Hrewp-
Latin
abruptus
English
abrupt
English, today
abruptly
Built from
From abrupt + -ly. abrupt Borrowed from Latin abruptus. First attested in 1583. Borrowed from Latin abruptus (“broken off”), perfect passive participle of abrumpō (“break off”), formed from ab (“from, away from”) + rumpō (“to break”).
Etymology from Wiktionary, CC BY-SA