The Collaborative International Dictionary of English v.0.48:
aversive \aversive\ adj. 1. of or pertaining to aversion. [WordNet 1.5] 2. exhibiting avoidance or causing avoidance. aversive conditioning aversive behavior [WordNet 1.5]WordNet (r) 3.0 (2006):
aversive adj 1: tending to repel or dissuade; "aversive conditioning"