1) Apt to speak irritably 2) Ill-natured 3) Inclined to bite 4) Irritable 5) Snappy 6) Tending to speak irritably 1) Cross 2) Curt 3) Knappish 4) Snappy 5) Testy 
• (a.) Sharp in reply; apt to speak angrily or testily; easily provoked; tart; peevish. • (a.) Apt to snap at persons or things; eager to bite; as, a snapping cur.
Snap'pish adjective 1. Apt to snap at persons or things; eager to bite; as, a snapping cur. 2. Sharp in reply; apt to speak angrily or testily; easily provoked; tart; peevish. « The taunting address of a snappish misanthrope.» Jeffrey. -- 
[adj] - tending to speak irritably
snappy adjective tending to speak irritably; `a snappish tone of voice`