All 4 Uses of

abrupt
in
Selected Tales, by Poe

I could not help thinking of the wild ritual of this work, and of its probable influence upon the hypochondriac, when, one evening, having informed me abruptly that the lady Madeline was no more, he stated his intention of preserving her corpse for a fortnight, (previously to its final interment,) in one of the numerous vaults within the main walls of the building.†
Scene 3

abruptly = suddenly and unexpectedly

"And you have not seen it?" he said abruptly, after having stared about him for some moments in silence—"you have not then seen it?†
Scene 3 *

Here again I paused abruptly, and now with a feeling of wild amazement—for there could be no doubt whatever that, in this instance, I did actually hear (although from what direction it proceeded I found it impossible to say) a low and apparently distant, but harsh, protracted, and most unusual screaming or grating sound—the exact counterpart of what my fancy had already conjured up for the dragon's unnatural shriek as described by the romancer.†
Scene 3

His voice varied rapidly from a tremulous indecision (when the animal spirits seemed utterly in abeyance) to that species of energetic concision—that abrupt, weighty, unhurried, and hollow-sounding enunciation—that leaden, self-balanced and perfectly modulated guttural utterance, which may be observed in the lost drunkard, or the irreclaimable eater of opium, during the periods of his most intense excitement.†
Scene 3

Definitions:

(1) (abrupt as in: an abrupt change)
sudden and unexpected

or (less commonly): characterized by sudden changes or at a steep angle
(2) (abrupt as in: she is abrupt)
rude or unfriendly because of using too few words or moving too quickly