1. (a.) Beginning, ending, or changing suddenly; broken off; very steep; as, an abrupt cliff\; precipitous; steep; as, abrupt places.

2. (a.) Without notice to prepare the mind for the event; sudden; hasty; unceremonious.

3. (a.) Having sudden transitions from one subject to another; unconnected.

4. (a.) Suddenly terminating, as if cut off.

5. (n.) An abrupt place.

6. (v. t.) To tear off or asunder.

aggressive arduous bearish beastly bluff blunt blunt-edged blunt-ended blunt-pointed blunted bluntish bold brash breakneck breathless brief brisk brusque casual cavalier churlish crisp crusty curt discourteous dull dull-edged dull-pointed dulled dullish edgeless electrifying faired gruff harsh hasty headlong hurried impetuous impolite impulsive informal nerve-shattering obtuse panting perpendicular plumb plunging pointless precipitant precipitate precipitous quick rapid rash ready rough rounded rude rushing severe sharp sheer shocking short sideling smoothed snappish snappy snippety snippy speedy startling steep stickle sudden surly surprising swift truculent unannounced unanticipated unceremonious uncivil unedged unexpected unforeseen unlooked-for unplanned unpointed unpredicted unsharp unsharpened vertical