a.
1.
Broken, cragged, craggy, rough, rugged, jagged.
2.
Steep, precipitous, acclivous, acclivitous.
3.
Sudden, unexpected, unanticipated, precipitate, hasty, unseasonable, ill-timed, unlooked for, unannounced.
4.
Short, blunt, unceremonious, curt, brusk ( or brusque ), rude, rough, inconsiderate, uncomplaisant, discourteous.
5.
Inelegant ( as style ), stiff, cramped, harsh, disconnected, unconnected.