The Collaborative International Dictionary of English v.0.48:
kittenish \kit"ten*ish\, a. Resembling a kitten; playful; as, a kittenish disposition. --Richardson. [1913 Webster] -- kit"ten*ish*ly, adv. -- kit"ten*ish*ness, n. [PJC]WordNet (r) 3.0 (2006):
kittenish adj 1: playful like a lively kitten [syn: kittenish, frisky]