Ornery

Pronunciation:
\ˈor-nə-rē, ˈär-; ˈȯrn-rē, ˈärn-\

Definition:
: having an irritable disposition : cantankerous

Etymology:
alteration of ordinary; 1816, Amer.Eng. dialectal contraction of ordinary. "Commonplace," hence "of poor quality, coarse, ugly." By c.1860 the sense had evolved to "mean, cantankerous."

First Known Use: 1816

Jim calls our cat, Lilly Belle, ornery. I must admit, she is a bit grumpy at all times, particularly since we introduce the kitten into the household. She hisses, growls, runs, and will even move to snap at anyone who touches her when she is in "a mood". She has yet to bite, but she is letting you know that she is thinking about it.
 
Yep. Ornery is a pretty good word for 'old Lilly Belle.