The Collaborative International Dictionary of English v.0.48:
Pettish \Pet"tish\, a. [From Pet.] Fretful; peevish; moody; capricious; inclined to ill temper. "A pettish kind of humor." --Sterne. -- Pet"tish*ly, adv. -- Pet"tish*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
pettishly adv 1: in a petulant manner; "he said testily; `Go away!'" [syn: testily, irritably, petulantly, pettishly]