aversive

adj

1. Tending to repel; causing avoidance.

   “"I say—Nora, you, really you?" he cried, transported in turn, and to do him justice he did not seem to notice anything aversive in her disorder—or, indeed, to notice anything but her excited young face.”

   “If it is aversive to the animal and discourages behavior, it is a punishment. If it seems aversive to you but is not aversive to the animal, then it is not an effective punishment. In fact, technically, it's not even a punishment.”

noun

1. A grammatical case indicating that something is avoided or feared; the evitative case.
2. An unpleasant stimulus intended to induce a change in behaviour.

   “For general training purposes, opportunities to engage in reproductive acts are not a practical reinforcer, and using aversives that generate fear is fraught with side effects.”