The Collaborative International Dictionary of English v.0.48:
Balky \Balk"y\ (b[add]k"[y^]), a. Apt to balk; as, a balky horse. [1913 Webster]WordNet (r) 3.0 (2006):
balky adj 1: stopping short and refusing to go on; "a balking"; "a balky mule"; "a balky customer" [syn: balking, balky]