1. [adj]  surprisingly and unceremoniously brusque in manner; "an abrupt reply"
2. [adj]  exceedingly sudden and unexpected; "came to an abrupt stop"; "an abrupt change in the weather"
3. [adj]  extremely steep; "an abrupt canyon"; "the precipitous rapids of the upper river"; "the precipitous hills of Chinese paintings"; "a sharp drop"
4. [adj]  marked by sudden changes in subject and sharp transitions; "abrupt prose"

ABRUPT is a 6 letter word that starts with A.

1. \Ab*rupt"\, a. [L. abruptus, p. p. of abrumpere to break
   off; ab + rumpere to break. See {Rupture}.]
   1. Broken off; very steep, or craggy, as rocks, precipices,
      banks; precipitous; steep; as, abrupt places. ``Tumbling
      through ricks abrupt,'' --Thomson.
   2. Without notice to prepare the mind for the event; sudden;
      hasty; unceremonious. ``The cause of your abrupt
      departure.'' --Shak.
   3. Having sudden transitions from one subject to another;
      unconnected.
            The abrupt style, which hath many breaches. --B.
                                                  Jonson.
   4. (Bot.) Suddenly terminating, as if cut off. --Gray.
   Syn: Sudden; unexpected; hasty; rough; curt; unceremonious;
        rugged; blunt; disconnected; broken.
   

2. \Ab*rupt"\, n. [L. abruptum.]
   An abrupt place. [Poetic]
         ``Over the vast abrupt.''                --Milton.
   

3. \Ab*rupt"\, v. t.
   To tear off or asunder. [Obs.] ``Till death abrupts them.''
   --Sir T. Browne.