1. 
[syn: temper, biliousness, irritability, peevishness, pettishness, snappishness, surliness]
The Collaborative International Dictionary of English v.0.48:
Snappish \Snap"pish\, a.
   1. Apt to snap at persons or things; eager to bite; as, a
      snapping cur.
      [1913 Webster]
   2. Sharp in reply; apt to speak angrily or testily; easily
      provoked; tart; peevish.
      [1913 Webster]
            The taunting address of a snappish misanthrope.
                                                  --Jeffrey.
      [1913 Webster] -- Snap"pish*ly, adv. --
      Snap"pish*ness, n.
      [1913 Webster]
WordNet (r) 3.0 (2006):
snappishness
    n 1: a disposition to exhibit uncontrolled anger; "his temper
         was well known to all his employees" [syn: temper,
         biliousness, irritability, peevishness,
         pettishness, snappishness, surliness]