aversive

from WordNet (r) 3.0 (2006)

aversive
    adj 1: tending to repel or dissuade; "aversive conditioning"

from 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]